JP7580718B2 - Used property purchase price determination system, used property purchase price determination method, and used property purchase price determination computer program - Google Patents

Description

The present invention relates to a used property purchase price determination system, a used property purchase price determination method, and a computer program for determining the purchase price of a used property, which can appropriately determine the purchase price when purchasing a rental property as a used property.

A system has been proposed to assist home purchases by calculating a purchase price that is lower than the list price of the home to be purchased based on the funds that a potential homebuyer can contribute and the rent when renting the home, and presenting contract terms accordingly (see, for example, Patent Document 1).

Patent No. 3411027

However, with the conventional system described above, it was difficult to understand how the purchase price would change depending on the rental period, so there was room to create a system for determining the purchase price that was easier for users to understand.

The present invention has been made in consideration of the above points, and aims to provide a used property purchase price determination system, a used property purchase price determination method, and a computer program for determining the purchase price of a used property that can establish a purchase price determination mechanism that is easier for users to understand and that can appropriately determine the purchase price of a used property.

To achieve the above objectives, the present invention has the following features:

(1) A used property purchase price determination system for determining the purchase price of a used property that is offered for rent, comprising:
A reference purchase price setting means for setting a reference purchase price as an initial value of the purchase price;
A rent setting means for setting the rent for the used property;
a discount rate setting means for setting a discount rate according to a rental period of the used property to a tenant currently residing or scheduled to residing in the used property as a prospective purchaser ;
a purchase price determination means for determining the purchase price by subtracting a discount amount based on the discount rate from the base purchase price,
The discount rate setting means adds an additional value to the discount rate corresponding to the specified period each time a specified period of the rental period elapses, and sets the added result as the discount rate corresponding to the next specified period , and is also capable of setting the discount rate after changing the additional value in accordance with information about the used property other than the rental period .

In the invention of (1), there is provided a used property purchase price determination system for determining the purchase price of a used property offered for rent. The used property purchase price determination system includes a base purchase price setting means, a rent setting means, a discount rate setting means, and a purchase price determination means.
The base purchase price setting means sets a base purchase price as an initial value of the purchase price.
The rent setting means sets the rent for the used property.
The discount rate setting means sets a discount rate according to the rental period of the used property for a tenant currently residing in or planning to residing in the used property as a potential purchaser, and adds an additional value to the discount rate corresponding to the specified period each time a specified period of the rental period elapses, setting the added result as the discount rate corresponding to the next specified period, and also makes it possible to set the discount rate after changing the additional value according to information about the used property other than the rental period .
The purchase price determination means determines the purchase price by subtracting a discount amount based on the discount rate from the base purchase price.

According to the invention of (1), when determining the purchase price of a used property such as a rental house, a discount rate is set that is successively added by an additive value each time a specified period of time elapses as the rental period, and a discount amount corresponding to each discount rate is obtained for each specified period. As a result, the purchase price corresponding to each specified period is determined by subtracting each discount amount from the base purchase price for each specified period, so that the change in purchase price according to the rental period can be presented in an easy-to-understand manner, and a purchase price determination system that is easier to understand for those who wish to purchase rental houses and owners who plan to sell them can be constructed, and ultimately the purchase price of rental houses as used properties can be appropriately determined.

(2) The used property purchase price determination system described in (1) is characterized in that the discount rate setting means applies different values as the additional value depending on whether or not there are restrictions on rebuilding or remodeling the used property, as information about the used property.

According to the invention of (2), different additional values are applied depending on whether there are restrictions on rebuilding or remodeling a used property, and a discount rate is set that is appropriately and incrementally added depending on whether such restrictions exist, so that it is possible to determine an appropriate purchase price for each specified period while dealing with the presence or absence of such restrictions.

(3) The used property purchase price determination system described in (1) or (2), characterized in that the discount rate setting means applies a larger value as the additional value when the useful life of the used property has expired than when the useful life has not expired, as information about the used property.

According to the invention of (3), when the useful life of a used property has expired, a smaller additional value is applied than when the useful life has not expired. Therefore, by using different additional values depending on whether the useful life has expired or not, it is possible to determine an appropriate purchase price for each specified period.

(4) A used property purchase price determination method implemented by a used property purchase price determination system for determining the purchase price of a used property offered for rent, comprising the steps of:
a reference purchase price setting step of setting a reference purchase price as an initial value of the purchase price;
A rent setting step for setting a rent for the used property;
A discount rate setting step of setting a discount rate according to a rental period of the used property for a tenant who is currently residing in or will be residing in the used property as a prospective purchaser ;
a purchase price determination step of determining the purchase price by subtracting a discount amount based on the discount rate from the base purchase price,
A method for determining the purchase price of a used property, characterized in that in the discount rate setting step, an additional value is added to the discount rate corresponding to the specified period each time a specified period of the rental period elapses, and the added result is set as the discount rate corresponding to the next specified period, and the discount rate can be set after changing the additional value depending on information about the used property other than the rental period .

(4) A method for determining the purchase price of a used property for rent, comprising:
a reference purchase price setting step of setting a reference purchase price as an initial value of the purchase price;
A rent setting step for setting a rent for the used property;
A discount rate setting step of setting a discount rate based on the rent already paid;
a purchase price determination step of determining the purchase price by subtracting a discount amount based on the discount rate from the base purchase price,
A method for determining the purchase price of a used property, characterized in that in the discount rate setting step, an additional value is added to the discount rate corresponding to each specified period of the rental period, and the added result is set as the discount rate corresponding to the next specified period.

(5) A computer program for determining the purchase price of a used property to be executed by a computer in order to determine the purchase price of a used property offered for rent, comprising:
a program for causing the device to function as a reference purchase price setting means for setting a reference purchase price as an initial value of the purchase price;
A program for causing the used property to function as a rent setting means for setting the rent of the used property;
a program for causing the used property to function as a discount rate setting means for setting a discount rate according to the rental period of the used property to a tenant currently residing in or planning to residing in the used property as a potential purchaser ;
a program for causing the program to function as a purchase price determination means for determining the purchase price by subtracting a discount amount based on the discount rate from the base purchase price,
A computer program for determining the purchase price of a used property, characterized in that the program for functioning as the discount rate setting means adds an additional value to the discount rate corresponding to a specified period each time a specified period of the rental period elapses, sets the added result as the discount rate corresponding to the next specified period, and includes a program for making it possible to set the discount rate after changing the additional value in accordance with information about the used property other than the rental period.

(5) A computer program for determining the purchase price of a used property to be executed by a computer in order to determine the purchase price of a used property offered for rent, comprising:
a program for causing the device to function as a reference purchase price setting means for setting a reference purchase price as an initial value of the purchase price;
A program for causing the used property to function as a rent setting means for setting the rent of the used property;
a program for causing the device to function as a discount rate setting means for setting a discount rate based on the rent that has already been paid;
a program for causing the program to function as a purchase price determination means for determining the purchase price by subtracting a discount amount based on the discount rate from the base purchase price,
A computer program for determining the purchase price of a used property, characterized in that the program for functioning as the discount rate setting means includes a program for adding an additional value to the discount rate corresponding to a specified period each time a specified period of the rental period elapses, and setting the additional result as the discount rate corresponding to the next specified period.

According to the invention (5), by executing each program on a computer, it is possible to achieve the same effect as the invention (1).

The present invention makes it possible to provide a system for determining purchase prices that is easier for users to understand, and thus to provide a system for determining purchase prices for used properties, a method for determining purchase prices for used properties, and a computer program for determining purchase prices for used properties that can appropriately determine the purchase prices of used properties.

1 is a block diagram showing a functional configuration of a used property purchase price determination system according to an embodiment of the present invention. 4 is a flowchart showing a purchase price determination process by a used property purchase price determination system according to one embodiment of the present invention. FIG. 2 is an explanatory diagram for explaining the display result by the used property purchase price determination system according to one embodiment of the present invention. FIG. 2 is an explanatory diagram for explaining the display result by the used property purchase price determination system according to one embodiment of the present invention. FIG. 2 is an explanatory diagram for explaining the display result by the used property purchase price determination system according to one embodiment of the present invention.

Embodiments of the present invention will be described below with reference to the drawings. In the following description, identical or similar components will be given the same reference numerals, and their description will be omitted or simplified.

Figure 1 is a block diagram showing the functional configuration of a used property purchase price determination system according to one embodiment of the present invention. The used property purchase price determination system according to this embodiment is a system that can determine and present an appropriate purchase price for a used property to a prospective buyer, who is a current or prospective tenant of a rental property as a used property. Used properties include detached houses such as old houses with land, as well as used condominiums. The used property purchase price determination system is realized by, for example, a general personal computer (hereinafter referred to as "PC") 1 including input/output peripheral devices. The used property purchase price determination system may be configured, for example, such that the main functions of the system are provided in a web server that can be connected to the Internet, and the web server presents a purchase price to a web client of a prospective buyer via a web browser in response to a request from the web client.

PC1 is primarily used by investors or other landlords who own used properties, real estate agents who broker used properties, or remodeling contractors, and is used to present the purchase price of a used property to a tenant. In the following explanation, landlords, real estate agents, remodeling contractors, and tenants are collectively referred to as users. PC1 includes input means 10, base purchase price determination means 11, rent setting means 12, discount rate setting means 13, purchase price determination means 14, and display means 15. Input means 10 is realized by a keyboard, mouse, etc. Base purchase price setting means 11, rent setting means 12, discount rate setting means 13, and purchase price determination means 14 are realized by a computing device including a CPU, ROM, RAM, storage device, etc. The CPU performs processing to be executed as each of the above means based on the basic program stored in the ROM and the application program stored in the storage device, using the RAM as a data working area. The programs for functioning as the base purchase price setting means 11, the rental fee setting means 12, the discount rate setting means 13, and the purchase price determination means 14 are realized by application programs stored in a storage device. The display means 15 is realized by a display device such as a liquid crystal display. Although not shown, a printing device may be connected to the PC 1, and the information displayed by the display means 15 may be printed by the printing device.

The input means 10 is used by the user to input various setting information necessary for determining the purchase price of a used property. The setting information that can be input includes the name of the used property, the rental contract date of the used property, the base purchase price (initial value) of the used property (in the following explanation, this may be referred to as the "purchase price" in this embodiment), the rent of the used property (in the following explanation, this may be referred to as the "rent" in this embodiment), the discount rate (in the following explanation, this may be referred to as the "purchase OP %" in this embodiment) for calculating the discount amount (in the following explanation, this may be referred to as the "purchase OP discount amount" in this embodiment) based on the rent already paid, and an additional value (in the following explanation, this may be referred to as the "purchase OP % additional value" in this embodiment) for increasing the purchase OP % depending on the rental period. Of these setting information, the property name and rental contract date are required to be input. Meanwhile, other setting information such as purchase price, rent, purchase OP %, and purchase OP % addition value are basically input manually by the user with reference to real estate market prices, etc., but it is not necessary to input all of these; for example, the purchase OP % addition value is automatically set by inputting the various conditions related to the building restrictions described below as selection information.

The base purchase price setting means 11 sets the purchase price entered by the user as the base purchase price specified in the calculation program for determining the purchase price of a used property. Such a purchase price (base purchase price) is set to an upper limit of, for example, 20 million yen, and as will be described in detail later, if the rental period exceeds, for example, 15 years, the purchase option discount amount exceeds the purchase price and the purchase price is considered to be 0 yen.

The rent setting means 12 sets the rent input by the user as the rent stipulated in the calculation program for determining the purchase price of a used property. The rent (rent) is basically input and set as a monthly fee.

The discount rate setting means 13 sets the purchase OP % input by the user as the discount rate specified in the calculation program for determining the purchase price of a used property. The purchase OP % (discount rate) is basically input and set as the initial value for the first year of the rental period when the first year has passed from the rental contract date. In addition, the discount rate setting means 13 sets a rate obtained by cumulatively adding the purchase OP % addition value (addition value) as the purchase OP % (discount rate) corresponding to the second, third, etc. years of the rental period each time one year has passed, based on the calculation program for determining the purchase price of a used property.

For example, if the initial value of the purchase OP% (discount rate) for the first year of the rental period is set to 10%, and the purchase OP% add-on value (add-on value) is set to +3%, the purchase OP% (discount rate) for the second, third, and fourth years of the rental period will be 13%, 16%, and 19%. In this embodiment, for used properties that cannot be rebuilt due to lack of access to a road, used properties that are illegal and do not meet existing standards due to exceeding the floor area ratio or building coverage ratio, and used properties that are unregistered or have leasehold rights, the purchase OP% add-on value (add-on value) is set to +3% as the minimum preferential condition. This is determined by balancing the fact that it is almost impossible to obtain loans from general financial institutions when purchasing such used properties, and therefore buyers are unlikely to appear and the selling price tends to be low.

In addition, for used properties such as properties that have suffered an accident due to psychological defects, old properties that have outlived their useful life, and terraced houses (multiple-family buildings) that are difficult to rebuild or remodel, the purchase OP % addition (additional value) is set at +5% as a highly preferential condition, slightly higher than the minimum preferential condition.

Furthermore, in the case of used properties such as buildings with defects that do not fall under the minimum or high preferential conditions above, buildings that are within their useful life, or land with an old house, the purchase OP % addition (additional value) is set at +10%, which is the highest preferential condition, even higher than the high preferential condition.

By specifying via the input means 10 whether the used property to be sold falls under the lowest, highest, or most preferential conditions, the corresponding value is automatically applied to such a purchase OP % addition value (addition value). Furthermore, the discount rate setting means 13 may determine the purchase OP % addition value (addition value) to be either the lowest, highest, or most preferential conditions based on information about the used property that has been input in advance (information about whether or not it can be rebuilt, illegality, useful life, etc.). Furthermore, the discount rate setting means 13 may determine the purchase OP % addition value (addition value) from one, two, or even four or more categories, rather than being limited to these three categories.

The purchase price determination means 14 calculates the total rent payment that has been paid so far based on the set monthly rent (rent) for each rental period, based on a calculation program for determining the purchase price of a used property, and calculates the purchase OP discount amount (discount amount) by multiplying this total rent payment by the purchase OP % (discount rate) set for each rental year, and then determines the purchase price for each rental year by subtracting the purchase OP discount amount (discount amount) corresponding to each rental year from the purchase price (standard purchase price). On the other hand, the purchase price determination means 14 calculates the sales corresponding to each rental year by adding up the total rent payment and the purchase price for each rental year for each rental period, based on a calculation program for determining the purchase price of a used property, and calculates the profit margin corresponding to each rental year by subtracting the purchase price (standard purchase price) from this sales. The sales and profit margin for each year calculated in this way are basically not presented to the tenant but can only be presented to the landlord, etc.

The display means 15 individually displays the input/set property name, rental contract date, purchase price (base purchase price), rent (rent), and purchase option % addition value (addition value), as well as the total rent payment for each rental year, purchase option % (discount rate), purchase option discount amount (discount amount), purchase price, sales, and profit margin in a table format by rental year. Note that it is preferable that the sales and profit margin for each rental year are displayed only when a lessor other than the lessee performs a specified switching operation.

Next, the purchase price determination process for a used property by PC1 will be described with reference to FIG. 2. FIG. 2 is a flowchart showing the purchase price determination process.

As shown in Figure 2, in the purchase price determination process of PC1, first, a user (landlord, real estate agent, etc.) inputs the name of the used property to be sold, the rental contract date of the used property, and the preferential conditions via the input means 10, and information corresponding to these is set (stored) in a specified memory area of a storage device, for example (step S1). Note that the information corresponding to the preferential conditions is set as the purchase OP % addition value (addition value).

Next, when the purchase price (reference purchase price) is input via the input means 10, the reference purchase price setting means 11 sets (stores) the purchase price in a specified memory area of, for example, a storage device (step S2).

Next, when the monthly rent (rent) is input via the input means 10, the rent setting means 12 sets (stores) the rent, for example, in a specified memory area of a storage device (step S3).

Next, when the initial value of the purchase OP% (discount rate) for the rental period of one year is input via the input means 10, the discount rate setting means 13 sets (stores) the purchase OP% for the rental period of one year in a specified memory area of the storage device (step S4).

When the necessary information is input as described above, the purchase price determination means 14 automatically calculates the total rent payment, the purchase OP % (discount rate) cumulatively added by the purchase OP % addition value (addition value), and the purchase OP discount amount (discount amount) for each rental period 1st year, 2nd year, 3rd year, etc., and calculates and determines the purchase price of the used property for each rental year as the value obtained by subtracting the purchase OP discount amount (discount amount) from the purchase price (base purchase price) (step S5). At that time, the purchase price determination means 14 calculates the sales for each rental year by adding up the total rent payment and the purchase price, and also calculates and determines the profit margin for each rental year by subtracting the purchase price (base purchase price) from this sales. The purchase price, sales, and profit margin for each rental year calculated and determined in this way are displayed on the display means 15 as a purchase price OP table as shown in Figures 3 to 5.

Figures 3 to 5 are explanatory diagrams to explain the display results of the used property purchase price determination system.

First, when the user inputs the specified information and PC1 executes the purchase price determination process, a purchase price OP table like that shown in FIG. 3 is displayed. The property name "Building XX 2, XX Ward, Yokohama City", rental contract date "October 1, 2019", rent (monthly) "75,000 yen", purchase price "6,000,000 yen", and purchase OP % for the first year of the rental period "10%" are input by the user as examples. The purchase OP % addition value "3%" was automatically set by the user specifying the minimum preferential conditions.

In the purchase price OP table according to the purchase OP % addition value "3%" shown in Figure 3, (3) total rent payment, (4) purchase OP %, (5) purchase OP discount amount, (6) purchase price, (7) sales A, and (8) margin B are calculated and displayed for each year of the rental period, 1st year, 2nd year, 3rd year, etc. The (3) total rent payment is calculated by multiplying the rent (monthly) by the number of months equal to the (1) number of years corresponding to the rental period nth year. The (4) purchase OP % for the rental period nth year (excluding the 1st year) is calculated successively by adding the purchase OP % addition value "3%" for the rental period n-1th year. The (5) purchase OP discount amount is calculated by multiplying the (3) total rent payment by the (4) purchase OP %. The (6) purchase price is calculated by subtracting the (5) purchase OP discount amount from the purchase price. (7) Sales A is calculated by adding (3) total rent payment and (6) purchase price. (8) Profit margin B is calculated by subtracting the purchase price from (7) Sales A. Note that (7) Sales A and (8) Profit margin B can be switched between hidden and visible by the user performing a specified switching operation. Note that in this embodiment, as shown in FIG. 3, the actual purchase price becomes a negative value after the 14th year of the rental period, but if the purchase price becomes a negative value, the purchase price is displayed as a uniform "0 yen."

Similarly, if the user specifies highly preferential conditions and sets the purchase OP % addition value to "5%", a purchase price OP table like that shown in Figure 4 will be displayed. In the purchase price OP table corresponding to the purchase OP % addition value of "5%" shown in Figure 4, the actual purchase price will be a negative value from the 12th year of the rental period onwards, so the purchase price will be displayed as a flat "￥0".

On the other hand, if the user changes the purchase price to "￥10,000,000" and specifies the highest preferential conditions to set the purchase OP % addition value to "10%," a purchase price OP table such as that shown in FIG. 5 is displayed. In the purchase price OP table corresponding to the purchase OP % addition value "10%" shown in FIG. 5, the margin B decreases from the 6th year of the rental period, and in the 10th year of the rental period, the purchase OP % becomes "100%", and since sales A is equal to the purchase price, the margin B is displayed as "￥0". In this way, when the margin B of the current year becomes lower than the margin B of the previous year, the discount rate setting means 13 may maintain the previous year's purchase OP % (discount rate) without adding the purchase OP % addition value (addition value) from the current year onwards. For example, in the example shown in FIG. 5, since the profit margin B in the 6th year is lower than the profit margin B in the 5th year, the purchase OP% (discount rate) from the 6th year onwards may be maintained at the purchase OP% (discount rate) in the 5th year, which is 50%.

With this process for determining the purchase price of a used property, the purchase price (standard purchase price) and purchase OP% (discount rate) can be easily changed at will so that the purchase price becomes 0 yen, with a maximum rental period of around 15 years as a guideline. For periods longer than that, it becomes no different from purchasing a new property, so the benefits of paying rent for a used property while ultimately purchasing that used property can be clearly demonstrated.

In addition, while aiming for a maximum rental period of around 15 years, the purchase price (base purchase price) of a used property can be appropriately set based on the real estate market price, etc., and the purchase OP% (discount rate) can be appropriately set based on the property's condition, etc., and the rent (rental fee) can be appropriately set by calculating backwards from these values.

Alternatively, conversely, you can set the rent (rental fee) for a used property appropriately based on real estate market prices, etc., while aiming for a maximum rental period of around 15 years, and set the purchase OP% (discount rate) appropriately based on the property's condition, etc., and then calculate backwards from these values to appropriately set the purchase price (base purchase price) of the used property.

Furthermore, the purchase price (base purchase price) and purchase OP% (discount rate), etc. can be set appropriately so that the profit margin B is, for example, about 1.25 to 1.5 times the purchase price (base purchase price), while aiming for a maximum rental period of about 15 years.

The used property purchase price determination system of this embodiment described above can clearly show the change in purchase price according to the number of years of rental period, and can create a purchase price determination system that is easier to understand for prospective buyers and owners planning to sell rental housing as used properties, allowing the purchase price of rental housing to be determined appropriately. This makes it possible to take advantage of the characteristics of used properties while providing a convenient tool for those who need to deal with vacant houses and secure housing by utilizing this system.

In addition, different purchase OP % addition values (additional values) are applied depending on the different preferential conditions due to the presence or absence of restrictions on rebuilding or remodeling used properties, and the purchase OP % (discount rate) is set by appropriately and incrementally adding up depending on such different preferential conditions, so that it is possible to determine an appropriate purchase price for each rental period while taking into account the presence or absence of such restrictions.

In addition, in the case of used properties that have exceeded their useful life (old properties), an even smaller purchase OP % addition value (addition value) is applied than in the case of used properties that are still within their useful life, so by using different purchase OP % addition values (addition values) depending on whether the useful life has expired or not, it is possible to determine the appropriate purchase price for each rental period.

The present invention is not limited to the above embodiments.

In the above embodiment, the purchase OP % addition value (addition value) is set to a uniform fixed value (3%, 5%, 10%) throughout each year of the rental period, but it may be possible to change the purchase OP % addition value (addition value) from a year in the middle of the rental period, for example, to accommodate cases where the useful life is exceeded in a year in the middle of the rental period.

1 PC
10 Input means 11 Base purchase price determination means 12 Rent setting means 13 Discount rate setting means 14 Purchase price determination means 15 Display means

Claims (5)

A used property purchase price determination system for determining a purchase price of a used property offered for rent, comprising:
A reference purchase price setting means for setting a reference purchase price as an initial value of the purchase price;
A rent setting means for setting the rent for the used property;
a discount rate setting means for setting a discount rate according to a rental period of the used property to a tenant currently residing or scheduled to residing in the used property as a prospective purchaser ;
a purchase price determination means for determining the purchase price by subtracting a discount amount based on the discount rate from the base purchase price,
The discount rate setting means adds an additional value to the discount rate corresponding to the specified period each time a specified period of the rental period elapses, and sets the added result as the discount rate corresponding to the next specified period , and is also capable of setting the discount rate after changing the additional value in accordance with information about the used property other than the rental period . The used property purchase price determination system of claim 1, wherein the discount rate setting means applies different values as the additional value depending on whether or not there are restrictions on rebuilding or remodeling the used property as information about the used property . The used property purchase price determination system according to claim 1 or 2, characterized in that the discount rate setting means applies a larger value as the additional value when the useful life of the used property has expired than when the useful life has not expired. A used property purchase price determination method executed by a used property purchase price determination system for determining a purchase price of a used property offered for rent, comprising:
a reference purchase price setting step of setting a reference purchase price as an initial value of the purchase price;
A rent setting step for setting a rent for the used property;
A discount rate setting step of setting a discount rate according to a rental period of the used property for a tenant who is currently residing in or will be residing in the used property as a prospective purchaser ;
a purchase price determination step of determining the purchase price by subtracting a discount amount based on the discount rate from the base purchase price,
A method for determining the purchase price of a used property, characterized in that in the discount rate setting step, an additional value is added to the discount rate corresponding to the specified period each time a specified period of the rental period elapses, and the added result is set as the discount rate corresponding to the next specified period, and the discount rate can be set after changing the additional value depending on information about the used property other than the rental period . A computer program for determining a purchase price of a used property to be executed by a computer in order to determine the purchase price of a used property offered for rent,
a program for causing the device to function as a reference purchase price setting means for setting a reference purchase price as an initial value of the purchase price;
A program for causing the used property to function as a rent setting means for setting the rent of the used property;
a program for causing the used property to function as a discount rate setting means for setting a discount rate according to the rental period of the used property to a tenant currently residing in or planning to residing in the used property as a potential purchaser ;
a program for causing the program to function as a purchase price determination means for determining the purchase price by subtracting a discount amount based on the discount rate from the base purchase price,
A computer program for determining the purchase price of a used property, characterized in that the program for functioning as the discount rate setting means adds an additional value to the discount rate corresponding to a specified period each time a specified period of the rental period elapses, sets the added result as the discount rate corresponding to the next specified period, and includes a program for making it possible to set the discount rate after changing the additional value in accordance with information about the used property other than the rental period.

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