JP7634636B2 - Product sales data processing device and control program - Google Patents

Description

Embodiments of the present invention relate to a product sales data processing device and a control program for causing a computer to function as said device.

In the tax system where taxes are levied on the consumption of goods, there is a so-called reduced tax rate system in which the tax rate for goods that are directly related to daily life, such as beverages or foodstuffs, is lower than that for other goods. Under the reduced tax rate system, the tax rate for goods that are subject to the reduced tax rate is lower than the normal tax rate for goods that are not subject to the reduced tax rate. However, even if a product is subject to the reduced tax rate, there may be cases where it is not subject to the reduced tax rate depending on the form of consumption. For example, if the product subject to the reduced tax rate is defined as "beverages or foodstuffs excluding eating out," if the beverage or foodstuff purchased at a store is taken home, so-called take-out, it is subject to the reduced tax rate. However, if the beverage or foodstuff is eaten in a store, so-called eating in, it is treated as eating out, and is not subject to the reduced tax rate.

It is up to the consumer to decide whether to take home the beverage or food item they have purchased or eat it in the store. For this reason, in stores where eating in is available, the cashier will verbally confirm with consumers who have purchased food items that are subject to the reduced tax rate whether they are taking the item home or eating it in the store. If the item is to be eaten in the store, the cashier must operate a product sales data processing device such as a POS (Point Of Sales) so that the sales data for that product is processed at the normal tax rate rather than the reduced tax rate.

JP 2017-215794 A

The problem that the embodiments of the present invention aim to solve is to provide a product sales data processing device that can handle cases where the tax rate levied on a product varies depending on the form of consumption with simple operations.

In one embodiment, the product sales data processing device includes an identification means, a first calculation means, a detection means, a second calculation means, and a processing means. The identification means identifies a product. The first calculation means calculates the tax amount of the product identified by the identification means at the tax rate of the tax levied on the product. The detection means detects a change in the tax rate. When the detection means detects a change in the tax rate, the second calculation means calculates the tax amount of the product identified by the identification means at the changed tax rate. The processing means processes the product sales data with the tax amount calculated by the first calculation means for products for which a change in tax rate has not been detected, and processes the product sales data with the tax amount calculated by the second calculation means for products for which a change in tax rate has been detected.

FIG. 2 is a block diagram showing a main circuit configuration of a POS terminal according to an embodiment. FIG. 2 is a schematic diagram showing the main data structure of a product record stored in a product master file in the present embodiment. FIG. 2 is a schematic diagram showing the layout of main keys arranged on a keyboard of a POS terminal. FIG. 4 is a schematic diagram showing the main data structure of a tax rate table included in the POS terminal. FIG. 2 is a schematic diagram showing the main data structure of an SI table included in the POS terminal. FIG. 4 is a schematic diagram showing main work areas formed in a main memory of a POS terminal. FIG. 2 is a schematic diagram showing the main data structure of transaction data stored in a transaction area. 5 is a flowchart showing the procedure of a scanning process executed by a processor of the POS terminal. 5 is a flowchart showing the procedure of SI key processing executed by a processor of the POS terminal. 11 is a flowchart showing the procedure of eat-in key processing executed by a processor of the POS terminal. 11 is a flowchart showing the procedure of a tax exemption change process executed by a processor of the POS terminal. 11 is a flowchart showing the procedure of a tax-excluded price change process executed by a processor of the POS terminal. 11 is a flowchart showing the procedure of a tax-inclusive change process executed by a processor of the POS terminal. 11 is a flowchart showing the procedure of a tax rate change process executed by a processor of the POS terminal. FIG. 13 is a diagram showing an example of a registration screen displayed after the second product registration is completed. FIG. 13 is a diagram showing an example of a registration screen displayed after the registration of a third product is completed. FIG. 13 is a diagram showing an example of a registration screen displayed after the registration of a fourth product is completed. FIG. 13 is a diagram showing an example of a registration screen displayed after a tax exemption change process. FIG. 13 is a diagram showing an example of a registration screen displayed after the tax-inclusive change process. FIG. 13 is a diagram showing an example of a registration screen displayed after a tax rate change process. FIG. 13 shows an example of a total screen displayed after a subtotal key is input. FIG. 13 shows an example of an issued receipt.

Hereinafter, an embodiment of a product sales data processing device that can handle cases where the tax rate on a product varies depending on the form of consumption with a simple operation will be described with reference to the drawings.
In this embodiment, the normal tax rate on general products is 10%, and the tax rate on beverages and food products excluding eating out is a reduced tax rate of 8%. That is, the tax rate on beverages and food products is a reduced tax rate of 8% for takeaway, but a normal tax rate of 10% for in-store consumption. A POS (Point Of Sales) terminal installed at the checkout area of a retail store with an eat-in space where customers can eat and drink in the store is exemplified as a product sales data processing device of one embodiment.

Figure 1 is a block diagram showing the main circuit configuration of the POS terminal 10. The POS terminal 10 includes a processor 101, a main memory 102, an auxiliary storage device 103, a clock 104, a change machine interface 105, a communication interface 106, a keyboard 107, a scanner 108, a first display 109, a second display 110, a printer 111, and a system transmission path 112. The system transmission path 112 includes an address bus, a data bus, a control signal line, and the like. The system transmission path 112 interconnects the processor 101 with the main memory 102, the auxiliary storage device 103, the clock 104, the change machine interface 105, the communication interface 106, the keyboard 107, the scanner 108, the first display 109, the second display 110, and the printer 111. The processor 101, the main memory 102, and the auxiliary storage device 103 are connected by the system transmission path 112 to form the computer of the POS terminal 10.

The processor 101 corresponds to the central part of the computer. The processor 101 controls each part to realize various functions of the POS terminal 10 according to an operating system or application programs. The processor 101 is, for example, a CPU (Central Processing Unit).

The main memory 102 corresponds to the main storage portion of the computer. The main memory 102 includes a nonvolatile memory area and a volatile memory area. The main memory 102 stores an operating system or application programs in the nonvolatile memory area. The main memory 102 may also store data required for the processor 101 to execute processes for controlling each part in a nonvolatile or volatile memory area. The main memory 102 uses the volatile memory area as a work area where data is appropriately rewritten by the processor 101. The nonvolatile memory area is, for example, a ROM (Read Only Memory). The volatile memory area is, for example, a RAM (Random Access Memory).

The auxiliary storage device 103 corresponds to the auxiliary storage portion of the computer. For example, the auxiliary storage device 103 may be an Electric Erasable Programmable Read-Only Memory (EEPROM), a Hard Disk Drive (HDD), or a Solid State Drive (SSD). The auxiliary storage device 103 stores data used by the processor 101 when performing various processes, data created by the processes in the processor 101, etc. The auxiliary storage device 103 may also store the application programs described above.

The application programs stored in the main memory 102 or the auxiliary storage device 103 include control programs that describe the information processing executed by the POS terminal 10. There are no particular limitations on the method for installing the control programs in the main memory 102 or the auxiliary storage device 103. The control programs can be installed in the main memory 102 or the auxiliary storage device 103 by recording them on a removable recording medium, or by distributing the control programs by communication via a network. The recording medium can be in any form, such as a CD-ROM or memory card, as long as it can store the programs and is readable by the device.

The clock 104 functions as a time information source for the POS terminal 10. The processor 101 keeps track of the current date and time based on the time information kept by the clock 104.

The change machine interface 105 communicates data with the automatic change machine. The change machine interface 105 receives data on the amount inserted, the number of stored coins, etc. from the automatic change machine. The change machine interface 105 transmits the change data to the automatic change machine.

The communication interface 106 communicates data with the store server 20 connected via a network such as a wired LAN (Local Area Network) or a wireless LAN. The store server 20 includes a product master file 21. The product master file 21 may be formed in a storage device built into the store server 20, or may be formed in a storage device connected externally to the store server 20.

The product master file 21 stores product records 21R (see Figure 2). A product record 21R is created for each product. The main data structure of the product record 21R is shown in the schematic diagram of Figure 2. As shown in Figure 2, the product record 21R includes data items such as product code, product name, unit price, tax rate, tax type, attributes, etc.

The product code is a unique code assigned to each product to identify it. Typically, each product is affixed with a barcode symbol in which the product code has been barcoded, or a two-dimensional data code symbol in which the product code has been coded into two-dimensional data. Alternatively, an RFID (Radio Frequency Identification) tag in which the product code is stored may be affixed. The POS terminal 10 can register product sales data by reading the data from the barcode symbol, two-dimensional data code symbol, or RFID tag with a reading device.

The product name and unit price are the name and price per item of the product identified by the product code. Hereinafter, the product identified by the product code will be referred to as the product in question. The tax rate is the tax rate levied on the consumption of the product in question. If the product in question is not subject to the reduced tax rate, the tax rate is the regular tax rate of 10%. If the product in question is subject to the reduced tax rate, the tax rate is the reduced tax rate of 8%.

The tax type is information that identifies whether the tax is included in the price (inclusive tax), whether it is exclusive (not included in the price), or whether no tax is levied (exclusive tax). In this embodiment, the tax type for inclusive tax is "3", the tax type for exclusive tax is "2", and the tax type for exempt tax is "1".

The attributes are information that identifies whether or not a product is subject to the reduced tax rate. In this embodiment, beverages and food products, excluding eating out, are subject to the reduced tax rate. Therefore, the attributes of beverages and food products are information that indicates that they are products that are subject to the reduced tax rate. The attributes of other products are not information that indicates that they are products that are subject to the reduced tax rate.

The keyboard 107 and scanner 108 function as input devices for the POS terminal 10. As shown in FIG. 3, the keyboard 107 is a dedicated keyboard for the POS terminal 10 and has a number of function keys, such as a numeric keypad K1, a clear key K2, a multiplication key K3, a subtotal key K4, a deposit/cash total key K5, an SI (Selective Itemize) key K6, and an eat-in key K7. The uses of the SI key K6, which is the first function key, and the eat-in key K7, which is the second function key, will be described later.

Scanner 108 is an example of a reading device that reads code symbols such as barcodes and two-dimensional data codes. Scanner 108 may be a type that reads code symbols by scanning with laser light, or a type that reads code symbols from images captured by an imaging device.

The first display 109 and the second display 110 function as display devices for the POS terminal 10. The first display 109 displays information to the store clerk who operates the POS terminal 10. The second display 110 displays information to customers who have registered products to be purchased on the POS terminal 10. Examples of this type of display device that can be used include a liquid crystal display and an organic EL (Electroluminescence) display. A touch panel may be used as the first display 109 or the second display 110.

The printer 111 issues receipts by printing various characters or images on receipt paper. This type of printer 111 can be, for example, a thermal printer or a dot matrix printer.

The POS terminal 10 thus configured includes a tax rate table 31 having the data structure shown in Fig. 4 and an SI table 32 having the data structure shown in Fig. 5. The tax rate table 31 and the SI table 32 are stored in the auxiliary storage device 103. The tax rate table 31 and the SI table 32 may be stored in a non-volatile area of the main memory 102.
The tax rate table 31 stores a normal tax rate and a reduced tax rate. In this embodiment, 10% is stored as the normal tax rate, and 8% is stored as the reduced tax rate.

SI table 32 is a data table that describes the tax rate, tax type, and display information for each SI code. Specifically, a tax rate of "0", a tax type of "1", and display information of "tax exempt" are described in association with SI code "1". A tax rate of "10", a tax type of "2", and display information of "tax excluded" are described in association with SI code "2". A tax rate of "10", a tax type of "3", and display information of "tax included" are described in association with SI code "3". A tax rate of "10", a tax type of "-", and display information of "tax rate 10%" are described in association with SI code "4". The use of SI table 32 will be described later.

As shown in FIG. 6, the POS terminal 10 also creates work areas in the volatile area of the main memory 102, including a transaction area 41, a transaction amount area 42, a tax-exclusive total amount area 43, a tax-inclusive total amount area 44, and a changed tax rate area 45.

The transaction area 41 is an area for storing transaction data 41D (see FIG. 7) for a product sold in one transaction. When multiple products are sold in one transaction, the transaction data 41D for each product is stored in the transaction area 41.

7 is a schematic diagram showing the main data structure of the transaction data 41D. The transaction data 41D includes data items such as product code, product name, unit price, tax type, tax rate, attributes, points, tax amount, first price, second price, change status, etc. The product code, product name, unit price, tax type , tax rate , and attributes are data of the product record 21R. The points are the number of items sold. The tax amount is the amount of tax levied on the product. The uses of the first price, second price, and change status will be described later.

The transaction amount area 42 is an area for storing the amount paid by a customer for a transaction. The tax-exclusive total amount area 43 is an area for storing the tax-exclusive amount levied on the products sold in that transaction. The tax-inclusive total amount area 44 is an area for storing the tax-inclusive amount levied on the products sold in that transaction. The changed tax rate area 45 is an area for storing the changed tax rate when a product eligible for reduction is no longer eligible for reduction. In this embodiment, the changed tax rate is 10%, which is equal to the normal tax rate. The changed tax rate does not necessarily have to match the normal tax rate.

Next, the main operations of the computer, which is mainly the processor 101 of the POS terminal 1, will be explained. This explanation of the operations will clarify the uses of the SI key K6 and eat-in key K7, the use of the SI table 32, and the uses of the first price, second price, and change status.

Figures 8 to 14 are flow charts showing the main information processing procedures executed by the processor 101. The processor 101 executes this information processing according to a control program stored in the main memory 102 or the auxiliary storage device 103. Note that the information processing procedures are not limited to these. As long as similar results can be obtained, the information processing procedures can be implemented in various modified forms.

Figure 8 is a flow chart showing the procedure of the scanning process. When the processor 101 imports the data of the code symbol read by the scanner 108, the processor 101 starts the scanning process. First, in ACT 1, the processor 101 checks whether or not the data of the code symbol includes a product code. If the data of the code symbol does not include a product code, the processor 101 judges NO in ACT 1 and executes other processes. For example, if a barcode printed on a discount coupon is scanned by the scanner 108, the processor 101 executes the discount process.

If the code symbol data includes a product code, the processor 101 determines YES in ACT1 and proceeds to ACT2. The processor 101 acquires product data associated with the product code in ACT2 to identify the product specified by the product code. Specifically, the processor 101 controls the communication interface 106 to query the product data. This control causes the communication interface 106 to send a product data query command to the store server 20. The query command includes the product code. The query command is sent to the store server 20 via the network. The store server 20 that receives the query command searches the product master file 21 and reads out the product record 21R in which the product code included in the command is written. The store server 20 then transmits a response command including the data of the product record 21R to the POS terminal 10 that sent the query command. The response command is received by the communication interface 106 of the POS terminal 10 via the network. Thus, the processor 101 identifies the product specified by the product code and obtains the product data for that product, such as the product name, unit price, tax rate, tax type, attributes, etc.

After acquiring the product data, the processor 101 detects the tax type of the product data in ACT 3. If the tax type is "1", meaning that the product code of a non-taxable product has been read, the processor 101 proceeds from ACT 3 to ACT 4. The processor 101 sets the unit price of the product data as the first price in ACT 4. The processor 101 then adds the first price to the billing amount area 42 in ACT 5.

If the tax type is "2", that is, if the product code of a tax-exclusive product is read, the processor 101 proceeds from ACT 3 to ACT 6. In ACT 6, the processor 101 calculates the tax-exclusive amount from the unit price and tax rate of the product data using the following formula (1).
Tax-excluded amount = unit price × tax rate … (1)
After the calculation of the tax-exclusive amount has been completed, the processor 101 adds the tax-exclusive amount to the tax-exclusive total amount area 43 in ACT 7. The processor 101 then determines the amount obtained by adding the tax-exclusive amount to the unit price as the first price in ACT 8. The processor 101 then adds the first price to the billing amount area 42 in ACT 9.

If the tax type is "3", that is, if the product code of a tax-inclusive product is scanned, the processor 101 proceeds from ACT 3 to ACT 10. In ACT 10, the processor 101 calculates the tax-inclusive amount from the unit price and tax rate of the product data using the following formulas (2) and (3). Base price = unit price / (1 + tax rate) ... (2)
Tax-included amount = unit price - unit price … (3)
When the tax-inclusive amount has been calculated, the processor 101 adds the tax-inclusive amount to the tax-inclusive total amount area 44 in ACT 11. The processor 101 also sets the unit price as the first price in ACT 12. The processor 101 then adds the first price to the billing amount area 42 in ACT 13.

After completing the processing of ACT5, ACT9 or ACT13, the processor 101 creates transaction data 41D in ACT14. That is, the processor 101 creates transaction data 41D with the product code, product name, unit price, tax type, tax rate and attributes contained in the product data, as well as the points, tax amount, first price, second price and change status. Here, the points are the multiplier if a multiplier was entered using the numeric keypad K1 and multiplication key K3 immediately before the scanning input, and are "1" if no multiplier was entered. The tax amount is "0" for non-taxable products, the tax-exclusive amount calculated in the processing of ACT6 for tax-exclusive products, and the tax-inclusive amount calculated in the processing of ACT10 for tax-inclusive products. The first price is the unit price for non-taxable products, and is the price including tax for tax-exclusive and tax-inclusive products. The second price is "0" at this point.

When the creation of the transaction data 41D is finished, the processor 101 sets the change status of the transaction data 41D to "0" in ACT 15. Then, the processor 101 registers the transaction data 41D in the transaction area 41 in ACT 16. Furthermore, the processor 101 controls the first display 109 and the second display 110 so that the product name, number of items, unit price, etc. of the transaction data 41D are displayed in ACT 17. With this, the processor 101 ends the scanning process.

Figures 15, 16, and 17 are examples of the display on the first display 109 after the scanning process has been completed. Figure 15 shows the registration screen 50A when the product code of the first product "AAAAAA" sold as one transaction is read, followed by the product code of the second product "BBBBB". Here, the product "AAAAAA" is a tax-inclusive product with a unit price of 100 yen. The product "BBBBB" is a non-taxable product with a unit price of 100 yen.

The registration screen 50A is divided into a details area 51 and a latest area 52. In the details area 51, information about the first product "AAAAA" is displayed, including the product name "AAAAA", points "1", unit price "100", discount amount "0", amount "100", and tax type "included". The amount is calculated by multiplying the unit price by the points. The tax type "included" indicates that the product is tax-inclusive.

In the latest area 52, information about the second item "BBBBB" is displayed, including the item name "BBBBB", points "1", and unit price "100", as well as the total points "2" and total amount "200". The total points "2" is the sum of the points in the transaction data 41D registered in the transaction area 41. The total amount "200" is the amount stored in the billing amount area 42. In addition, area 521 of the latest area 52 displays the information "Non-taxable", indicating that the item "BBBBB" is a non-taxable item.

The first item, "AAAAAA," is a tax-inclusive item that is not subject to the reduced tax rate, so the regular tax rate of 10% is read from the tax rate table 31. Then, the tax-inclusive amount of 9 yen, which is the regular tax rate of 10% for a unit price of 100 yen, is added to the tax-inclusive total amount area 44. The unit price of 100 yen, which is the tax-inclusive price, is added to the billing amount area 42. The second item, "BBBBB," is a tax-exempt item, so the unit price of 100 yen is added directly to the billing amount area 42. Thus, the total amount is 200 yen.

Figure 16 shows registration screen 50B when the product code of the third product "CCCCC" is read while registration screen 50A of Figure 15 is being displayed on first display 109. Here, product "CCCCC" is a tax-inclusive product with a unit price of 100 yen.

In the details area 51 of the registration screen 50B, information about the first product "AAAAAA" and the second product "BBBBB" is displayed. Incidentally, the tax type "Non" indicates that the product is non-taxable.

In the latest area 52, the product name "CCCCC", points "1" and unit price "100" are displayed as information about the third product "CCCCC", as well as the total points "3" and total amount "300". Since the third product "CCCCC" is a tax-inclusive product, the normal tax rate of 10% is read from the tax rate table 31. Then, the tax-inclusive amount of 9 yen, which is the normal tax rate of 10% for a unit price of 100 yen, is added to the tax-inclusive total amount area 44, making the tax-inclusive amount 18 yen. In addition, the unit price of 100 yen, which is the tax-inclusive price, is added to the billing amount area 42, making the total amount 300 yen. In addition, area 521 of the latest area 52 displays the information "tax-inclusive" indicating that the product "CCCCC" is a tax-inclusive product.

Figure 17 shows registration screen 50C when registration screen 50B in Figure 16 is displayed on first display 109 and the product code of the fourth product, "DDDDD", is read. Here, product "DDDDD" is a tax-inclusive product with a unit price of 100 yen. Product "DDDDD" is a product subject to a reduced tax rate, such as foodstuffs.

Information about the first to third products, "AAAA," "BBBBB," and "CCCCC," is displayed in the details area 51 of the registration screen 50C.

In the latest area 52, the product name "DDDDD", points "1" and unit price "100" are displayed as information about the fourth product "DDDDD", and further the total points "4" and total amount "400" are displayed. Since the fourth product "DDDDD" is a tax-inclusive product subject to the reduced tax rate, the reduced tax rate of 8% is read from the tax rate table 31. Then, the tax-inclusive amount of 7 yen, which is the reduced tax rate of 8% for a unit price of 100 yen, is added to the tax-inclusive total amount area 44, making the tax-inclusive amount 25 yen. In addition, the unit price of 100 yen, which is the tax-inclusive price, is added to the billing amount area 42, making the total amount 400 yen. In addition, the area 521 of the latest area 52 displays information "reduced tax rate subject" indicating that the product "DDDDD" is a product subject to the reduced tax rate.

Returning to the explanation of the flow chart.
9 is a flow chart showing the procedure of the SI key processing. When the processor 101 detects that the SI key K6 of the keyboard 107 has been operated for input, the processor 101 starts the SI key processing. First, in ACT 21, the processor 101 checks whether the transaction data 41D is registered in the transaction area 41. If it is not registered, the processor 101 judges NO in ACT 21 and ends the SI key processing.

If the transaction data 41D is registered in the transaction area 41, the processor 101 judges YES in ACT 21 and proceeds to ACT 22. In ACT 22, the processor 101 checks whether a number has been entered by an input operation of the numeric keypad K1 immediately before the input of the SI key K6. If a number has not been entered, the processor 101 judges NO in ACT 22 and ends the SI key processing.

If a number was entered immediately before the input of the SI key K6, the processor 101 judges as YES in ACT 22 and proceeds to ACT 23. The processor 101 checks whether or not "1" was entered in ACT 23. If "1" was entered, the processor 101 judges as YES in ACT 23 and proceeds to ACT 24. The processor 101 refers to the SI table 32 in ACT 24 and obtains the tax rate, tax type, and display information associated with the SI code "1". Then, the processor 101 executes the tax exemption change process in ACT 25.

If "1" has not been entered, the processor 101 judges NO in ACT 23 and proceeds to ACT 26. The processor 101 checks whether "2" has been entered in ACT 26. If "2" has been entered, the processor 101 judges YES in ACT 26 and proceeds to ACT 27. The processor 101 refers to the SI table 32 in ACT 27 and obtains the tax rate, tax type, and display information associated with the SI code "2". Then, the processor 101 executes the tax exclusive change process in ACT 28.

If "2" has not been entered, the processor 101 judges NO in ACT 26 and proceeds to ACT 29. The processor 101 checks whether "3" has been entered in ACT 29. If "3" has been entered, the processor 101 judges YES in ACT 29 and proceeds to ACT 30. In ACT 30, the processor 101 refers to the SI table 32 and obtains the tax rate, tax type, and display information associated with the SI code "3". Then, the processor 101 executes the tax-inclusive change process in ACT 31.

If "3" has not been entered, the processor 101 judges NO in ACT 29 and proceeds to ACT 32. The processor 101 checks whether "4" has been entered in ACT 32. If "4" has been entered, the processor 101 judges YES in ACT 32 and proceeds to ACT 33. In ACT 33, the processor 101 refers to the SI table 32 and obtains the tax rate, tax type, and display information associated with the SI code "4". Then, the processor 101 executes a tax rate change process in ACT 34.

If "4" has not been entered, the processor 101 judges NO in ACT 32 and proceeds to ACT 35. The processor 101 executes processing other than the tax-exempt change processing, tax-exclusive change processing, tax-inclusive change processing, or tax rate change processing described above in ACT 35. The other processing is not particularly limited, so will not be mentioned here. Details of the tax-exempt change processing, tax-exclusive change processing, tax-inclusive change processing, or tax rate change processing will be described later.

Figure 10 is a flow diagram showing the procedure for eat-in key processing. When the processor 101 detects that the eat-in key K7 on the keyboard 107 has been operated for input, the processor 101 starts the eat-in key processing. First, the processor 101 checks in ACT 41 whether the transaction data 41D is registered in the transaction area 41. If it is not registered, the processor 101 judges NO in ACT 41 and ends the eat-in key processing.

If the transaction data 41D is registered in the transaction area 41, the processor 101 determines YES in ACT 41 and proceeds to ACT 42. The processor 101 executes tax rate change processing in ACT 42. The tax rate change processing is similar to the tax rate change processing executed in the SI key processing when the SI key K6 is operated to input after "4" is entered on the numeric keypad K1. That is, in the POS terminal 10, the tax rate change processing is executed when the combination operation of entering "4" on the numeric keypad K1 after registering a product and then operating the SI key K6 is performed, and when the eat-in key K7 is operated alone.

Next, the tax-exempt change process, the tax-exclusive change process, the tax-inclusive change process, and the tax rate change process will be described.
11 is a flow chart showing the procedure of the tax exemption change process. When the processor 101 enters the tax exemption change process, in ACT 51, it checks whether the tax type of the transaction data 41D registered in the transaction area 41 immediately before is "1", which indicates a tax exempt product. Hereinafter, the transaction data 41D registered in the transaction area 41 immediately before is referred to as transaction data 41Dx. In this embodiment, the product that is the target of the tax exemption change process is a tax-exclusive product or a tax-inclusive product. If the tax type of the transaction data 41Dx is "1", the processor 101 judges YES in ACT 51 and ends the tax exemption change process.

If the tax type of the transaction data 41Dx is other than "1", the processor 101 judges NO in ACT 51 and proceeds to ACT 52. In ACT 52, the processor 101 checks whether the tax type is "2", which indicates a tax-exclusive product, or "3", which indicates a tax-inclusive product.

If the tax type is "2", the processor 101 judges YES in ACT 52 and proceeds to ACT 53. In ACT 53, the processor 101 calculates the tax-exclusive amount from the unit price and tax rate of the transaction data 41Dx using the above-mentioned formula (1). In addition, the processor 101 sets the unit price of the transaction data 41Dx as the second price of the transaction data 41Dx in ACT 54. In addition, the processor 101 subtracts the tax-exclusive amount calculated in the processing of ACT 53 from the tax-exclusive total amount area 43 in ACT 54. Similarly, the processor 101 subtracts the tax-exclusive amount from the billing amount area 42 in ACT 55. After that, the processor 101 proceeds to ACT 60. The processing of ACT 60 will be described later.

In ACT 52, if the tax type is "3", the processor 101 judges NO in ACT 52 and proceeds to ACT 57. In ACT 57, the processor 101 calculates the base price and the inclusive tax amount from the unit price and tax rate of the transaction data 41Dx using the above-mentioned formulas (2) and (3). In ACT 58, the processor 101 sets the base price calculated in the processing of ACT 57 as the second price of the transaction data 41Dx. In ACT 59, the processor 101 subtracts the inclusive tax amount calculated in the processing of ACT 57 from the inclusive tax total amount area 44. After that, the processor 101 proceeds to ACT 60.

The processor 101 changes the tax type of the transaction data 41Dx to the non-taxable tax type "1" and sets the tax amount to "0" in ACT 60. The processor 101 also sets the change status of the transaction data 41Dx to "1" in ACT 61. The processor 101 then changes the display on the first display 109 and the second display 110 in accordance with the change status "1" in ACT 62.

In this way, when the operator enters "1" after registering the product and then operates the SI key K6, the POS terminal 10 executes the tax-exempt change process. That is, when the tax type of the transaction data 41Dx is "2", that is, when the tax-exempt change process is executed after registering a tax-exclusive product, the tax-exclusive amount of that tax-exclusive product is calculated. The tax-exclusive amount is then subtracted from the tax-exclusive total amount area 43 and the billing amount area 42. The second price of the transaction data 41Dx becomes the unit price, the tax type becomes "1", and the tax amount becomes "0". Therefore, the transaction data 41Dx of the tax-exclusive product is changed to the transaction data 41Dx of a non-taxable product and registered. At this time, the change status becomes "1". That is, the change status "1" indicates that the tax type has been changed from tax-exclusive to non-taxable. The display content is then changed on the first display 109 and the second display 110 so that it can be seen that the tax-exclusive product has been changed to a non-taxable product and registered.

On the other hand, if the tax type of transaction data 41Dx is "3", that is, if the tax-exempt change process is executed after the registration of a tax-inclusive product, the base price and tax-inclusive amount of the tax-inclusive product are calculated. The tax-inclusive amount is then subtracted from the tax-inclusive total amount area 44. The second price of transaction data 41Dx becomes the base price, the tax type becomes "1", and the tax amount becomes "0". Therefore, the transaction data 41Dx of a tax-inclusive product is changed to transaction data 41Dx of a non-taxable product and registered. At this time, the change status becomes "1". In other words, the change status of "1" also indicates that the tax type has been changed from tax-inclusive to non-taxable. The display content is then changed on the first display 109 and the second display 110 to show that the tax-inclusive product has been changed to a non-taxable product and registered.

Figure 18 shows a registration screen 50D when the tax-exempt change process is executed for the product "CCCCCC" while the registration screen 50B shown in Figure 16 is displayed. The unit price of the product "CCCCCC" is 100 yen, which includes the tax-inclusive amount of 9 yen at the normal tax rate of 10%, so the base price is 91 yen. Therefore, when the tax-exempt change process is executed, the unit price of the product "CCCCCC" becomes the base price of 91 yen saved as the second price. Then, in the latest area 52, information "tax-inclusive → tax-exempt" is displayed as an indication that the price has been changed from the tax-inclusive price of the first price to the base price of 91 yen, along with information "100 → 91 yen" indicating that the unit price has been changed from the tax-inclusive price of 100 yen of the first price to the base price of 91 yen of the second price. Furthermore, in the area 521 of the latest area 52, the display information "tax-exempt" obtained from the SI table 32 in the process of ACT24 is displayed.

Returning to the explanation of the flow chart.
12 is a flow chart showing the procedure of the tax-exclusive price change process. When the processor 101 starts the tax-exclusive price change process, it checks in ACT 71 whether the tax type of the transaction data 41Dx registered in the transaction area 41 immediately before is "1" indicating a tax-exclusive product. In this embodiment, the product that is the target of the tax-exclusive price change process is a tax-exclusive product. If the tax type of the transaction data 41Dx is other than "1", the processor 101 judges NO in ACT 71 and ends the tax-exclusive price change process.

If the tax type in the transaction data 41Dx is "1", meaning that the product registered immediately before is a non-taxable product, the processor 101 judges YES in ACT 71 and proceeds to ACT 72. In ACT 72, the processor 101 calculates the tax amount using the unit price in the transaction data 41Dx and the normal tax rate of 10% using the above formula (1). In ACT 73, the processor 101 sets the unit price to the second price in the transaction data 41Dx. In ACT 74, the processor 101 adds the tax amount to the tax-exclusive total amount area 43. In ACT 75, the processor 101 adds the tax amount to the billing amount area 42.

The processor 101 changes the tax type of the transaction data 41Dx to tax type "2" exclusive of tax in ACT 76, and changes the tax amount to the amount calculated in the processing in ACT 72. The processor 101 also sets the change status of the transaction data 41Dx to "2" in ACT 77. The processor 101 then changes the display on the first display 109 and the second display 110 in accordance with the change status "2" in ACT 78.

In this way, when the operator enters "2" after registering a product and then operates the SI key K6, the POS terminal 10 executes the tax-exclusive change process. That is, when the tax type in transaction data 41Dx is "1", that is, when the tax-exclusive change process is executed after registering a non-taxable product, the tax-exclusive amount, which is the normal tax rate of 10%, is calculated for the unit price of that product, and this tax-exclusive amount is added to the tax-exclusive total amount area 43 and the billing amount area 42. In addition, the second price in transaction data 41Dx becomes the unit price, the tax type becomes "2", and the tax amount is changed from "0" to the tax amount calculated in the process of ACT72. Therefore, the transaction data 41Dx of a non-taxable product is changed to the transaction data 41Dx of a tax-exclusive product and registered. At this time, the change status becomes "2". That is, the change status "2" indicates that the tax type has been changed from non-taxable to tax-exclusive. The display content on the first display 109 and the second display 110 will then change to indicate that the tax-exempt item has been changed and registered as a tax-exclusive item.

For example, the latest area 52 displays the information "Tax-free → Tax-exclusive" to indicate that the price has been changed from tax-free to tax-exclusive. The amount is the unit price of the second price. Area 521 of the latest area 52 displays the display information "Tax-exclusive" obtained from the SI table 32 in the processing of ACT27.

Figure 13 is a flow chart showing the steps of the tax-inclusive change process. When the processor 101 enters the tax-inclusive change process, it checks in ACT 81 whether the tax type of the transaction data 41Dx registered in the transaction area 41 immediately before is "1", indicating a tax-exempt product. In this embodiment, the product that is the subject of the tax-inclusive change process is a tax-exempt product. If the tax type of the transaction data 41Dx is other than "1", the processor 101 judges NO in ACT 81 and ends the tax-inclusive change process.

If the tax type in the transaction data 41Dx is "1", meaning that the product registered immediately before is a non-taxable product, the processor 101 judges YES in ACT 81 and proceeds to ACT 82. In ACT 82, the processor 101 calculates the tax amount using the unit price in the transaction data 41Dx and the normal tax rate of 10% using the above formula (1). In ACT 83, the processor 101 sets the total amount of the unit price and the tax amount as the second price in the transaction data 41Dx. In ACT 84, the processor 101 adds the tax amount to the tax-inclusive total amount area 44. In ACT 85, the processor 101 adds the tax amount to the billing amount area 42.

The processor 101 changes the tax type of the transaction data 41Dx to tax type "3" including tax in ACT 86, and changes the tax amount to the amount calculated in the processing of ACT 82. The processor 101 also sets the change status of the transaction data 41Dx to "3" in ACT 87. The processor 101 then changes the display on the first display 109 and the second display 110 in accordance with the change status "3" in ACT 88.

In this way, when the operator enters "3" after registering the product and then operates the SI key K6, the POS terminal 10 executes the tax-inclusive change process. That is, when the tax type of the transaction data 41Dx is "1", that is, when the tax-inclusive change process is executed after registering a non-taxable product, the tax amount at the normal tax rate of 10% is calculated for the unit price of the product, and this tax amount is added to the tax-inclusive total amount area 44 and the billing amount area 42. Also, the second price of the transaction data 41Dx becomes the tax-inclusive price obtained by adding the unit price and the tax amount, the tax type becomes "3", and the tax amount is changed from "0" to the tax amount calculated in the process of ACT82. Therefore, the transaction data 41Dx of the non-taxable product is changed to the transaction data 41Dx of the tax-inclusive product and registered. At this time, the change status becomes "3". That is, the change status "3" indicates that the tax type has been changed from non-taxable to tax-inclusive. The display content on the first display 109 and the second display 110 will then change to indicate that the tax-exempt item has been changed and registered as a tax-inclusive item.

For example, the latest area 52 displays the information "tax-free → tax included" to indicate that the price has been changed from tax-free to tax included. The amount is the second price including tax. The display information "tax included" obtained from the SI table 32 in the processing of ACT 30 is displayed in area 521 of the latest area 52.

Figure 19 shows registration screen 50E when tax-inclusive price change processing is executed for tax-exempt product "BBBBB" with registration screen 50A in Figure 15 displayed. Through the tax-inclusive price change processing described above, a tax amount of 10 yen is calculated from the unit price of product "BBBBB" of 100 yen and the normal tax rate of 10%, and a tax-inclusive price of 110 yen is calculated, which becomes the second price. Then, in the immediately preceding area, information "tax-exempt → tax-inclusive" is displayed, along with information "100 → 110 yen", which indicates that the first price of 100 yen has been changed to the second price of 110 yen. Furthermore, the total amount becomes 210 yen, and the display information "tax-inclusive" is displayed in area 521.

Returning to the explanation of the flow chart.
14 is a flow chart showing the procedure of the tax rate change process. When the processor 101 enters the tax rate change process, it acquires the attribute of the transaction data 41Dx registered in the transaction area 41 immediately before in ACT 91. The processor 101 then checks whether or not this attribute is information indicating that the product is subject to a reduced tax rate. In this embodiment, if the product registered immediately before is not a beverage or food product, it is not subject to a reduced tax rate. In this case, the processor 101 judges NO in ACT 91 and ends the tax rate change process.

In this embodiment, if the product registered immediately before is a beverage or food product, it is a product subject to a reduced tax rate. In this case, the processor 101 determines YES in ACT 92 and proceeds to ACT 93. In ACT 93, the processor 101 checks the tax type of the transaction data 41Dx. In this embodiment, beverages or food products are tax-inclusive or tax-exclusive products. Therefore, the tax type of the transaction data 41Dx is "2" or "3".

If the tax type in the transaction data 41Dx is "2", i.e., if the product is tax-exclusive, the processor 101 determines YES in ACT 93 and proceeds to ACT 94. In ACT 94, the processor 101 calculates the pre-change tax amount A from the tax rate and unit price in the transaction data 41Dx using the above formula (1). Incidentally, the tax rate in the transaction data 41Dx is a reduced tax rate of 8%.

In ACT 95, the processor 101 obtains the changed tax rate from the changed tax rate area 45. The changed tax rate is the normal tax rate of 10%. In ACT 96, the processor 101 calculates the changed tax amount B from this changed tax rate of 10% and the unit price using the above formula (1). In ACT 97, the processor 101 sets the second price in the transaction data 41Dx as the unit price. In ACT 98, the processor 101 adds the difference value obtained by subtracting the pre-change tax amount A from the changed tax amount B to the tax-exclusive total amount area 43. Similarly, in ACT 99, the processor 101 adds the difference value to the billing amount area 42. After that, the processor 101 proceeds to ACT 108. The processing in ACT 108 will be described later.

On the other hand, if the tax type in the transaction data 41Dx is "3", that is, if the product is tax-inclusive, the processor 101 judges NO in ACT 93 and proceeds to ACT 100. In ACT 100, the processor 101 calculates the base price and tax-inclusive amount included in the unit price from the tax rate and unit price in the transaction data 41Dx using the above formulas (2) and (3). Incidentally, the tax rate in the transaction data 41Dx is a reduced tax rate of 8%.

The processor 101 obtains the changed tax rate from the changed tax rate area 45 as ACT101. The changed tax rate is the normal tax rate of 10%. The processor 101 calculates the changed tax amount C from this changed tax rate of 10% and the unit price using the above formula (1) as ACT102. The processor 101 sets the second price of the transaction data 41Dx to the tax-inclusive amount obtained by adding the changed tax amount C to the unit price as ACT103.

The processor 101 subtracts the tax-inclusive amount from the tax-inclusive total amount area 44 in ACT 104. Then, the processor 101 adds the changed tax amount C to the tax-inclusive total amount area 44 in ACT 105. Similarly, the processor 101 subtracts the tax-inclusive amount from the billing amount area 42 in ACT 106. Then, the processor 101 adds the changed tax amount C to the billing amount area 42 in ACT 107. The processor 101 then proceeds to ACT 108.

The processor 101 changes the tax rate of the transaction data 41Dx to the changed tax rate in ACT 108, and changes the tax amount to changed tax amount B or changed tax amount C. The processor 101 also updates the change status of the transaction data 41Dx to "4" in ACT 109. The processor 101 then changes the display on the first display 109 and the second display 110 in accordance with the change status "4" in ACT 110.

In this way, when the operator enters "4" after registering the product and then operates the SI key K6, the POS terminal 10 executes the tax rate change process. In addition, when the eat-in key K7 is operated after registering the product, the POS terminal 10 also executes the tax rate change process. In detail, when the tax rate change process is executed when the attribute of the transaction data 41Dx is information indicating that the product belongs to a reduced tax rate, the tax amount of the product is changed from the reduced tax rate of 8% to the modified tax rate of 10%. Therefore, the product subject to the reduced tax rate is changed to a product with the modified tax rate and registered. At this time, the change status becomes "4". In other words, the change status "4" indicates that the tax rate has been changed from the reduced tax rate to the modified tax rate. The display content is then changed on the first display 109 and the second display 110 so that it can be seen that the tax rate has been changed from the reduced tax rate to the modified tax rate and registered.

Figure 20 shows the registration screen 50F after the tax rate change process is executed for the tax-inclusive product "DDDDDD" subject to the reduced tax rate with the registration screen 50C of Figure 17 displayed. The tax rate change process described above calculates the tax-inclusive amount of 7 yen for the reduced tax rate of 8% for the unit price of 100 yen of the product "DDDDDD" and the base price of 93 yen. In addition, the base price of 93 yen and the changed tax rate of 10% calculate a changed tax amount C of 9 yen. The second price is the base price of 93 yen plus the changed tax amount of 9 yen, resulting in a tax-inclusive amount of 102 yen. Thus, the information "tax rate change" is displayed in the previous area, along with the information "100 → 102 yen" indicating that the first price has been changed from 100 yen to the second price of 102 yen. In addition, the total amount becomes 402 yen, and the display information "tax rate 10%" is displayed in the area 521.

Now, when the subtotal key K4 is operated while the registration screen 50F in FIG. 20 is displayed, the screen of the first display 109 becomes the total screen 60 shown in FIG. 21, for example. The total screen 60 consists of a details area 61 and a total area 62. The details area 61 displays the name, number, unit price, discount amount, amount, tax type, etc. of the products registered as one transaction. And for the product "DDDDD" for which a tax rate change has been made, a mark M1 indicating that a tax rate change has been made is displayed to distinguish it from other products. The total area 62 displays the total number, total amount, and tax-inclusive amount.

When the deposit/cash key K5 is operated to make a cash payment while the total screen 60 in FIG. 21 is displayed, a receipt 70 with a layout as shown in FIG. 22, for example, is printed by the printer 111. As shown in FIG. 22, the receipt 70 prints the tax-inclusive price (¥100) and tax-inclusive amount (¥7) before the tax rate change for the product "DDDDD" and the tax-inclusive price (¥102) and tax-inclusive amount (¥9) based on the new tax rate. The tax-inclusive price and tax amount before the change are printed with a strikethrough. The mark "Light" indicates that the product "DDDDD" is subject to the reduced tax rate, and the subsequent printed information "Eat-in (8% → 10%)" indicates that the tax rate has changed from the reduced tax rate of 8% to the new tax rate of 10% due to eating and drinking in the store.

In the POS terminal 10 of this embodiment, the computer mainly composed of the processor 101 constitutes an identification means for identifying a product by executing the processes of ACT1 and ACT2 in FIG. 8 in cooperation with a reading device such as the scanner 108. The computer also constitutes a first calculation means by executing the processes of ACT6 or ACT10 in FIG. 8. In other words, the computer calculates the tax-exclusive or tax-inclusive amount of the product identified by the identification means at the normal tax rate levied on the product.

The computer also constitutes a detection means by executing the processes of ACT21, ACT22, ACT32, and ACT33 in FIG. 9 or the process of ACT41 in FIG. 10 in cooperation with the keyboard 107. That is, the computer detects a change in the tax rate. In detail, the computer detects a change in the tax rate when a specific key operation is performed on the keyboard 107, which is an input device equipped with a numeric keypad K1 and multiple function keys. Here, the specific key operation is a combination operation of the numeric keypad K1 and the SI key K6, which is the first function key, or a single operation of the eat-in key K7, which is the second function key.

The computer also constitutes a second calculation means by executing the processes of ACT 93 to ACT 96 and ACT 100 to ACT 102 in FIG. 14. That is, when the detection means detects a change in the tax rate, the computer calculates the tax amount of the product identified by the identification means at the changed tax rate.

The computer also constitutes a processing means by executing the processes of ACT7 to ACT9, ACT11 to ACT14 in Fig. 8, and ACT97 to ACT99 and ACT103 to ACT108 in Fig. 14. That is, the computer processes the sales data of products for which a change in tax rate has not been instructed, using the tax amount calculated by the first calculation means, and processes the sales data of products for which a change in tax rate has been instructed, using the tax amount calculated by the second calculation means.

With a POS terminal 10 configured in this way, even when the tax rate levied on a product changes depending on the form of consumption, the operator can handle the change with simple operations. Specifically, the operator can handle the change in tax rate by operating a specific key on the keyboard 107. For example, the operator can enter "4" on the numeric keypad K1 and operate the SI key K6. Alternatively, the operator can operate the eat-in key K7.

Here, it is up to the operator to decide whether to handle the tax rate change by a combined operation of the numeric keypad K1 and SI key K6, or by a single operation of the eat-in key K7. In the case of a combined operation, the operating procedure is the same as when changing the tax type from tax-exclusive or tax-inclusive to non-taxable, or from non-taxable to tax-exclusive or tax-inclusive. Therefore, for operators who are accustomed to the operation, the combined operation is considered to be easier to use. On the other hand, however, the combined operation is complicated in that two types of keys must be operated. For this reason, for operators who are not accustomed to the operation, the single operation of the eat-in key K7 is considered to be easier to use.

In this embodiment, the operator is assumed to be a store clerk, but the operator is not necessarily limited to a store clerk. In the case of a self-service POS terminal where the customer performs the process from registering the product to paying, the operator is the customer.

The POS terminal 10 is equipped with a first display 109 as a display means. A computer mainly composed of a processor 101 controls the first display 109 so that a total screen 60 with the layout shown in FIG. 21 is displayed on the first display 109. Here, the computer constitutes the first control means. That is, the computer displays a mark M1 on products for which the tax amount has been calculated by the second calculation means, thereby distinguishing products for which the tax rate has been changed from products for which the tax rate has not been changed. Therefore, the operator can easily identify products for which the tax rate has been changed from the information on the total screen 60.

The POS terminal 10 also includes a printer 111 as a means for issuing receipts. A computer mainly composed of a processor 101 controls the printer 111 to issue a receipt 70 with the layout shown in FIG. 22. Here, the computer constitutes the second control means. That is, the computer distinguishes products for which the tax amount has been calculated by the second calculation means from products for which the tax rate has not been changed. Specifically, for products for which the tax amount has been calculated by the first calculation means, the computer prints the amount and tax amount before the tax rate change and the amount and tax amount after the tax rate change side by side, and prints a strikethrough through the amount and tax amount before the tax rate change. Therefore, a customer who receives a receipt 70 can easily confirm the amount and tax amount before the change and the amount and tax amount after the change for products for which the tax rate has been changed from the information on the receipt 70.

The above describes an embodiment of a product sales data processing device that can handle cases where the tax rate on a product varies depending on the form of consumption with simple operations, but the embodiment is not limited to this.

For example, in the above embodiment, a POS terminal 10 was exemplified that includes a first operation combining the numeric keypad K1 and the SI key K6, and a second operation of operating the eat-in key K7 alone, as an operator operation for instructing a change in the tax rate. In this regard, the POS terminal 10 may be equipped only with the first operation combining multiple keys. Alternatively, the POS terminal 10 may be equipped only with the second operation using a single key.

Furthermore, the operator's operation is not necessarily limited to key operations. For example, in the case of a POS terminal equipped with a touch panel as an input device, a computer based on the processor 101 may detect that a specific portion of the touch panel has been touched as an operator's operation instructing a change in the tax rate when it detects this. Also, instead of an operator's operation, a change in the tax rate may be detected, for example, from the operator's gesture.

In the above embodiment, the first calculation means calculates the tax amount of a product at the tax rate of the tax levied on the product, and then, when the detection means detects a change in the tax rate, the second calculation means calculates the tax amount of the product at the changed tax rate. In this regard, if the detection means detects a change in the tax rate before the first calculation means calculates the tax amount of a product at the tax rate of the tax levied on the product, the second calculation means may calculate the tax amount of the product at the changed tax rate.

For example, before using the scanner 108 to read the code symbol of a product subject to the reduced tax rate, the operator confirms with the customer whether or not the customer is eating in the restaurant. If the customer is eating in the restaurant, the operator presses the eat-in key K7, for example, and then uses the scanner 108 to read the code symbol. In response to such an operation, if the processor 101 confirms that the tax type is "2" in ACT 3 of FIG. 8, it may execute the processing of ACT 95 and ACT 96 in FIG. 14, and then execute the processing of ACT 7 to ACT 9 and ACT 14 to ACT 17 in FIG. 8. If the processor 101 confirms that the tax type is "3" in ACT 3 of FIG. 8, it may execute the processing of ACT 101 to ACT 102 in FIG. 14, and then execute the processing of ACT 10 to ACT 17 in FIG. 8.

In the above embodiment, in ACT 22 of FIG. 9, it was confirmed whether or not a number had been entered by input operation of the numeric keypad K1 immediately before input of the SI key K6. In this regard, it is also possible to wait for input operation of the numeric keypad K1 after input of the SI key K6. In this case, the processor 101 transitions to processing in ACT 24 when, for example, "1" is entered by the numeric keypad K1, transitions to processing in ACT 27 when "2" is entered, transitions to processing in ACT 30 when "3" is entered, and transitions to processing in ACT 33 when "4" is entered.

In the above embodiment, the first function key used in combination with the numeric keypad K1 is the SI key K6, but the first function key is not limited to the SI key K6. In short, it is sufficient if it is a function key that can be identified as an operator's operation to instruct a change in tax rate in combination with the numeric keypad K1. It goes without saying that the value of the number entered with the numeric keypad K1 is not limited to "4". In this regard, the same is true for the second function key, and it is not necessarily limited to the eat-in key K7. It is sufficient if the second function key is a function key that can be identified as an operator's operation to instruct a change in tax rate with a single operation.

In the above embodiment, an example is shown in which the registration screens 50A-50F and the total screen 60 are displayed on the first display 109. In another embodiment, the registration screens 50A-50F and the total screen 60 may be displayed on the second display 110. The receipt 70 may also be an electronic receipt.

Although several other embodiments of the present invention have been described, these embodiments are presented as examples and are not intended to limit the scope of the invention. These novel embodiments can be implemented in various other forms, and various omissions, substitutions, and modifications can be made without departing from the spirit of the invention. These embodiments and their modifications are included within the scope of the invention and the scope of the invention and its equivalents described in the claims.
The invention as originally claimed in the present application is set forth below.
[1] A product sales data processing device comprising: an identification means for identifying a product; a first calculation means for calculating the amount of tax on a product identified by the identification means using the tax rate of the tax levied on the product; a detection means for detecting a change in the tax rate; a second calculation means for calculating the amount of tax on the product identified by the identification means using the changed tax rate when the detection means detects a change in the tax rate; and a processing means for processing product sales data for products for which a change in the tax rate has not been detected using the tax amount calculated by the first calculation means, and for products for which a change in the tax rate has been detected using the tax amount calculated by the second calculation means.
[2] A product sales data processing device as described in appendix [1], further comprising an input device having a numeric keypad and a plurality of function keys, wherein the detection means detects a change in the tax rate when a predetermined key operation is performed on the input device.
[3] The product sales data processing device according to appendix [2], wherein the predetermined key operation is a combination operation of a numeric keypad and a first function key.
[4] A product sales data processing device as described in appendix [2], wherein the predetermined key operation is a single operation of a second function key.
[5] A product sales data processing device described in any one of appendices [1] to [4], further comprising a display means for displaying information about the product for which the sales data has been processed by the processing means, and a first control means for differentiating the display form of the information between products for which the tax amount has been calculated by the first calculation means and products for which the tax amount has been calculated by the second calculation means.
[6] A product sales data processing device as described in any one of appendices [1] to [4], further comprising: an issuing means for issuing a receipt on which information about the product for which the sales data has been processed by the processing means is recorded; and a second control means for causing the information recorded on the receipt to differ between products for which the tax amount has been calculated by the first calculation means and products for which the tax amount has been calculated by the second calculation means.
[7] A control program for causing a computer of a product sales data processing device to function as an identification means for identifying a product, a first calculation means for calculating the amount of tax on a product identified by the identification means at the tax rate of the tax levied on the product, a detection means for detecting a change in the tax rate, a second calculation means for calculating the amount of tax on a product identified by the identification means at the changed tax rate when the detection means detects a change in the tax rate, and a processing means for processing product sales data for products for which a change in the tax rate has not been detected at the tax rate using the tax amount calculated by the first calculation means, and for products for which a change in the tax rate has been detected at the tax rate using the tax amount calculated by the second calculation means.

10... POS terminal, 101... processor, 102... main memory, 103... auxiliary storage device, 104... clock, 105... change machine interface, 106... communications interface, 107... keyboard, 108... scanner, 109... first display 109... second display, 111... printer, 112... system transmission path, 20... store server, 21... product master file, 31... tax rate table, 32... SI table, 41... transaction area, 42... billing amount area, 43... tax-exclusive total amount area, 44... tax-inclusive total amount area, 45... changed tax rate area, K1... numeric keypad, K6... SI key, K7... eat-in key.

Claims (7)

An input means for inputting a product code for identifying a product;
a first calculation means for calculating a tax amount of a product whose product code has been inputted via the input means using a tax rate levied on the product;
a creation means for creating transaction data including a product code, a tax rate, and a change status when a product code is input via the input means, the change status being a value indicating that the tax rate has not been changed;
a detection means for detecting a change in a tax rate levied on the product for which the transaction data was generated;
a second calculation means for calculating a tax amount of a commodity for which a change in tax rate has been detected by the detection means, using the changed tax rate;
an update means for updating, when the detection means detects a change in a tax rate levied on a product for which the transaction data has been created , the tax rate included in the transaction data for the product to the changed tax rate and updating the change status to a value indicating that the tax rate has been changed;
a processing means for processing the billing amount of a commodity for which a change in the tax rate has not been detected, using the tax amount calculated by the first calculation means, and for which a change in the tax rate has been detected, using the tax amount calculated by the second calculation means;
A product sales data processing device comprising: The tax rates include a reduced tax rate imposed on products subject to reduced tax rates and a normal tax rate imposed on products not subject to reduced tax rates.
2. The product sales data processing device according to claim 1, wherein said second calculation means calculates the tax amount of said product at a normal tax rate only if said product for which said tax rate change has been detected is a product subject to said reduced tax rate. 3. A product sales data processing device as described in claim 2, wherein the creation means creates transaction data in which the tax rate is the reduced tax rate if the product whose product code is input via the input means is subject to the reduced tax rate, and in which the tax rate is the normal tax rate if the product is not subject to the reduced tax rate. The transaction data further includes a first price and a second price;
the creation means sets the first price to an amount specified by the unit price of the product whose product code is input via the input means, the tax type, and the tax rate, and sets the second price to zero;
2. A product sales data processing device as described in claim 1, wherein the update means includes means for changing the second price included in the transaction data for a product for which a change in the tax rate has been detected to a price determined from the tax amount calculated by the second calculation means and the unit price of the product, and for not changing the first price. a price display means for displaying, for the commodity for which a change in the tax rate has been detected by the detection means, that the price has been changed from the first price to the second price due to the change in the tax rate;
The product sales data processing device according to claim 4, further comprising: a display means for displaying information about the product whose transaction amount has been processed by the processing means;
a control means for changing a display form of information on a commodity for which a tax amount is calculated by the first calculation means and a display form of information on a commodity for which a tax amount is calculated by the second calculation means;
The product sales data processing device according to any one of claims 1 to 5, further comprising: A computer of a product sales data processing device having an input means for inputting a product code that identifies a product,
a first calculation means for calculating a tax amount of a product whose product code has been input via the input means using a tax rate levied on the product;
a creation means for creating transaction data including a product code, a tax rate, and a change status when a product code is input via the input means, the change status being a value indicating that the tax rate has not been changed;
detection means for detecting a change in the rate of a tax levied on the product for which the transaction data was generated;
a second calculation means for calculating a tax amount of a commodity for which a change in tax rate has been detected by said detection means, using the changed tax rate;
an update means for updating, when the detection means detects a change in a tax rate levied on a product for which the transaction data has been created , the tax rate included in the transaction data for the product to the changed tax rate and updating the change status to a value indicating that the tax rate has been changed;
a processing means for processing the billing amount of a commodity for which a change in the tax rate has not been detected, using the tax amount calculated by the first calculation means, and for processing the billing amount of a commodity for which a change in the tax rate has been detected, using the tax amount calculated by the second calculation means;
A control program that functions as a