JP5375367B2 - Communication apparatus, image processing apparatus, and program - Google Patents

Description

  The present invention relates to a communication device, an image processing device, and a program.

  A technique for efficiently performing transmission to a plurality of destinations having different protocols is known (see, for example, Patent Document 1). In this Patent Document 1, the transmission order when there are a plurality of destinations waiting for transmission is determined according to a predetermined priority order based on the type of protocol used for transmission, and transmission to destinations waiting for transmission is performed according to the determined order. Processing is being executed. For example, when IP-FAX, SIP-FAX, and G3-FAX destinations are mixed in a destination waiting for transmission, transmission processing is executed in the order of IP-FAX destination, SIP-FAX destination, and G3-FAX destination. This enables efficient transmission.

JP 2007-208448 A

  An object of the present invention is to perform broadcast transmission of transmission target data while reducing the capacity of a storage unit that stores the transmission target data.

The invention according to claim 1 is a first transmission means for transmitting data using a public line network, a second transmission means for transmitting data using a LAN, a first destination and a second destination. Storage means for storing transmission target data that is a target of broadcast transmission to the first destination, a first transmission speed that is a transmission speed when the first transmission means transmits data to the first destination, and the second transmission rate obtaining means for obtaining a second transmission speed which is, has been the first transmission speed and the second acquired by the acquisition unit when transmitting data by the transmission means and said to destination second the faster transmission speed of the transmission speed, and a changing means for changing so as to approach the slower transmission rate of the first transmission means or the second transmission means, stored in said storage means The transmission target data is changed to the changing means. A communication device and transmits at the transmission rate after change due.
According to a second aspect of the present invention, the first transmission unit or the second transmission unit is configured to apply a connection established to a destination of the first destination and the second destination. Transmitting a predetermined amount of data as an amount necessary for maintaining a connection at a predetermined time until a connection with both the first destination and the second destination is established. The communication device according to claim 1.
The invention according to claim 3 is characterized in that the acquisition means calculates the first transmission rate and the first transmission rate by performing a calculation based on a transmission rate of information for establishing a connection with the first destination and the second destination. The communication apparatus according to claim 1, wherein the second transmission speed is acquired.
According to a fourth aspect of the present invention, the acquisition unit is configured to calculate the first transmission rate and the first transmission rate based on a calculation based on a transmission rate of the transmission target data by the first transmission unit and the second transmission unit . The communication apparatus according to claim 1 , wherein a transmission speed of 2 is acquired.
The invention according to claim 5 is a first transmission means for transmitting data using a public network, a second transmission means for transmitting data using a LAN, a first destination and a second destination. Storage means for storing transmission target data that is a target of broadcast transmission to the first destination, and a first transmission speed that is a transmission speed at the time of transmitting data to the first destination by the first transmission means . 1 acquisition means, second acquisition means for acquiring a second transmission speed, which is a transmission speed when data is transmitted to the second destination by the second transmission means , and the first acquisition means When the first transmission rate acquired by the second acquisition unit is slower than the second transmission rate acquired by the second acquisition unit, the second transmission rate approaches the first transmission rate. and a changing means for changing manner, the first transmission hand And said second transmission means comprises a transmission to the first destination in the first transmission speed of the transmission target data stored in the storage means, the transmission target data stored in said storage means is a communication device which is characterized in that in parallel with each transmission to the changing means and the second destination in the second transmission speed after change by.
According to a sixth aspect of the present invention, there is provided a reading unit that reads an image from a recording medium on which the image is recorded, and an image that is the target of broadcast transmission to a plurality of destinations of the image data read by the reading unit. Writing means for writing data as storage means; acquisition means for acquiring a plurality of transmission speeds including a transmission speed when data is transmitted to each of the plurality of destinations; and the plurality of transmission speeds acquired by the acquisition means Change means for changing a transmission speed other than the slowest specific transmission speed so as to approach the specific transmission speed, and changing the image data written in the storage means by the writing means by the changing means and transmitting means for transmitting to said parallel to the plurality of the plurality of destinations at a transmission speed after said writing means, read a new by said reading means The data of the serial image is an image processing device and writes to the area of said storage means for the image data transmitted has been stored by the transmission means.
The invention according to claim 7 is a first transmission function for transmitting data to a computer using a public line network, a second transmission function for transmitting data using a LAN, a first destination and a first transmission function. A storage function for storing transmission target data, which is a target of broadcast transmission to two destinations, in a storage unit, and a transmission speed when data is transmitted to the first destination by the first transmission function. An acquisition function for acquiring a second transmission speed, which is a transmission speed when transmitting data to the second destination by the second transmission function, and the acquired first transmission speed and the first the faster transmission speed of the second transmission speed, to realize a changing function of changing so as to approach the slower transmission rate of the first transmission function or the second transmission function, in the storage means The stored transmission target data is A program and transmits at the transmission rate of Sarago.

According to the first aspect of the present invention, it is possible to perform broadcast transmission of the transmission target data while suppressing the capacity of the storage unit that stores the transmission target data to be small as compared with the case where the present configuration is not provided.
According to the second aspect of the present invention, it is possible to make it difficult for the previously established connection to be disconnected as compared with the case where this configuration is not provided.
According to the third aspect of the present invention, the capacity of the storage means for storing the transmission target data can be reduced from the initial stage of the broadcast transmission of the transmission target data, compared to the case where this configuration is not provided. .
According to the fourth aspect of the present invention, the capacity of the storage means for storing the transmission target data is dynamically reduced after the broadcast transmission of the transmission target data is started, compared to the case where the present configuration is not provided. Can be adjusted.
According to the fifth aspect of the present invention, it is possible to perform broadcast transmission of the transmission target data while suppressing the capacity of the storage means for storing the transmission target data to be smaller than in the case where this configuration is not provided.
According to the sixth aspect of the present invention, it is possible to perform broadcast transmission of image data while suppressing the capacity of the storage means for storing the image data as compared with the case where the present configuration is not provided.
According to the seventh aspect of the present invention, it is possible to perform broadcast transmission of the transmission target data while suppressing the capacity of the storage means for storing the transmission target data, as compared with the case where the present configuration is not provided.

It is the figure which showed the example of whole structure of the image communication system in embodiment of this invention. It is the figure which showed the schematic sequence in embodiment of this invention. It is the figure shown about the transmission part of the image data in the general | schematic sequence of embodiment of this invention. It is the figure which showed the function structural example of the communication apparatus in embodiment of this invention. It is the flowchart which showed the operation example of the communication apparatus in embodiment of this invention.

Embodiments of the present invention will be described below in detail with reference to the accompanying drawings.
FIG. 1 is a diagram illustrating a configuration example of an image communication system to which the exemplary embodiment is applied.
As shown in the figure, in this image communication system, the image processing apparatus 20 is connected to the image processing apparatus 10 via a PSTN (Public Switched Telephone Networks) 25 and the image processing apparatus 30 is connected to a LAN (Local Area Network). ) 35, so that they can be communicated bidirectionally.

Among these, the image processing apparatus 10 is, for example, a facsimile apparatus that transmits / receives image data to / from the image processing apparatus 20 via the PSTN 25 and to / from the image processing apparatus 30 via the LAN 35. Details of the configuration of the image processing apparatus 10 will be described later.
The image processing apparatus 20 is assumed to be, for example, a G3-FAX that transmits / receives image data to / from the image processing apparatus 10 via the PSTN 25. Here, G3-FAX is a recommendation T.30 of ITU-T (International Telecommunication Union-Telecommunication sector). This refers to a facsimile machine that transmits and receives image data using a protocol conforming to the standard No. 30.
The image processing apparatus 30 is assumed to be, for example, an IP-FAX that transmits / receives image data to / from the image processing apparatus 10 via the LAN 35. Here, IP-FAX is ITU-T recommendation T.264. 37 or T.W. This refers to a facsimile machine that transmits and receives image data using a protocol conforming to 38. Recommendation ITU-T. In the case of IP-FAX conforming to 37, image data is transmitted and received as an e-mail attachment file. Also, ITU-T recommendation T.A. In the case of IP-FAX conforming to 38, image data is transmitted and received by a method of converting a G3-FAX modem signal into a packet and transmitting it in real time. In the present embodiment, the image processing apparatus 10 and the image processing apparatus 30 will be described as being connected via the LAN 35. 37 or T.W. As long as image data can be transmitted and received by a protocol compliant with the standard 38, the LAN 35 may be routed via the Internet or may be routed via the PSTN.

Here, the image processing apparatus 10 will be described in detail.
As illustrated, the image processing apparatus 10 includes a CPU (Central Processing Unit) 11, a RAM (Random Access Memory) 12, a ROM (Read Only Memory) 13, an image reading unit 14, an image storage memory 15, A LAN interface (hereinafter referred to as “LAN I / F”) 16, a PSTN interface (hereinafter referred to as “PSTNI / F”) 17, and an image forming unit 18 are included.

The CPU 11 implements each function to be described later with reference to FIG. 4 by loading various programs stored in the ROM 13 or the like into the RAM 12 and executing them.
The RAM 12 is a memory used as a working memory for the CPU 11.
The ROM 13 is a memory that stores various programs executed by the CPU 11.
The image reading unit 14 reads an image recorded on a recording medium such as paper. Here, the image reading unit 14 is, for example, a scanner, and a CCD system in which reflected light with respect to light irradiated from a light source to a document is reduced by a lens and received by a CCD (Charge Coupled Devices), or an LED light source is sequentially irradiated onto a document. It is preferable to use a CIS system that receives reflected light with respect to the received light with a CIS (Contact Image Sensor). In the present embodiment, an image reading unit 14 is provided as an example of a reading unit that reads an image from a recording medium.

The image storage memory 15 is a memory for storing image data (image data) read by the image reading unit 14. In the present embodiment, an image storage memory 15 is provided as an example of a storage unit that stores transmission target data that is a target of broadcast transmission.
The LAN I / F 16 transmits image data stored in the image storage memory 15 to the image processing apparatus 30 via the LAN 35 and receives image data from the image processing apparatus 30 via the LAN 35.
The PSTNI / F 17 transmits the image data stored in the image storage memory 15 to the image processing apparatus 20 via the PSTN 25 or receives image data from the image processing apparatus 20 via the PSTN 25.
The image forming unit 18 forms an image on a recording medium such as paper. Here, the image forming unit 18 is, for example, a printer, and forms an image by transferring the toner attached to the photosensitive member to a recording medium to form an image, or ejecting ink onto the recording medium. An ink jet type may be used.

  Now, consider a case where the image processing apparatus 10 having such a configuration broadcasts image data read by the image reading unit 14 to the image processing apparatus 20 and the image processing apparatus 30. Here, it is assumed that the data transmission speed of the LAN 35 is 100 Mbps, and the data transmission speed of the PSTN 25 is 14.4 Kbps. Then, since the data transmission speed of the LAN 35 is faster than the data transmission speed of the PSTN 25, if the image data stored in the image storage memory 15 is transmitted as it is at these data transmission speeds, the image data transmitted via the LAN 35 is not transmitted. Must be stored in the image storage memory 15 until it is transmitted via the PSTN 25, and the image storage memory 15 cannot be released. Therefore, for example, when there is a job for continuously reading an image with the image reading unit 14, the throughput is lowered.

Therefore, in the present embodiment, broadcast transmission can be performed to the image processing apparatus 20 and the image processing apparatus 30 with a small amount of the image storage memory 15.
FIG. 2 is a diagram for explaining the outline of the present embodiment.
As shown in the figure, first, the image reading control task 42 controls the image reading unit 14 to read an image recorded on a recording medium (A). The read image data is stored in the image storage memory 15 (B).
Next, the LAN communication control task 43 and the PSTN communication control task 44 respectively read image data from the image storage memory 15 (C, D). Then, the LAN communication control task 43 controls the LAN I / F 16 to transmit the read image data to the image processing apparatus 30 (E), and the PSTN communication control task 44 controls the PSTNI / F 17 to send to the image processing apparatus 20. Transmit (F). In this case, reading of image data in C, reading of image data in D, transmission of image data in E, and transmission of image data in F are performed simultaneously on the multitasking OS.

The transmission of image data in E and F will be described in detail.
FIG. 3 is a diagram showing, in chronological order, procedures related to transmission of image data in E and F.
When transmission of image data is instructed, first, negotiation is performed in each of the LAN 35 and the PSTN 25 (E-1, F-1). Here, the negotiation means that two devices determine communication settings while exchanging information such as a communication speed when communication is started. If the negotiation in the LAN 35 is completed earlier as shown in the figure, the LAN 35 is connected to the LAN 35 by continuously sending a small amount of image data such as 1 byte for 3 seconds until the negotiation in the PSTN 25 is completed. Maintained (E-2).

  Thereafter, when the negotiation in the PSTN 25 is also finished, the data transmission speed in the LAN 35 and the data transmission speed in the PSTN 25 are measured (E-3, F-3), respectively. As a result of this measurement, it is found that the data transmission speed of the LAN 35 is 100 Mbps and the data transmission speed of the PSTN 25 is 14.4 Kbps in the figure. Then, the slower of the measured data transmission speed of the LAN 35 and the data transmission speed of the PSTN 25 is determined as the subsequent data transmission speed. Here, since the data transmission rate of PSTN 25 is 14.4 Kbps, the subsequent data transmission rate is 14.4 Kbps. That is, the image data is transmitted in 1800 (= 14400/8) bytes per second, for example, 10 times (E-4, F-4). Thereafter, in the LAN 35 and the PSTN 25, the data transmission speed is dynamically measured (E-5, F-5), and the image data is transmitted at the slowest data transmission speed at that time.

  In FIG. 3, the LAN 35 transmits image data at 14.4 Kbps in accordance with the PSTN 25 even though the data transmission speed is 100 Mbps. Here, since the image data is transmitted to only one image processing device 30 by the LAN 35, the data transmission capability is not utilized much, but the image data is transmitted to the plurality of image processing devices 30 by the LAN 35. The data transmission capability can be utilized more effectively. For example, when transmitting image data to N image processing apparatuses 30, 1800 bytes may be transmitted to N destinations in parallel, and this may be repeated 10 times. Recommendation ITU-T. Such a transmission is possible as long as it is a method of transmitting image data as a packet for each destination, such as a protocol compliant with 38.

Thus, broadcast transmission of image data can be performed in a short time, and image data can be transmitted almost simultaneously to a plurality of destinations. Therefore, when the image data is broadcast by specifying the time, the accuracy of the time when the image data arrives is improved.
In the above, the LAN 35 is an example of a line capable of transmitting data to a plurality of destinations in parallel. On the other hand, the PSTN 25 is an example of a line through which data is sequentially transmitted to a plurality of destinations.

Next, means for realizing such a general operation will be described in detail.
In FIG. 2, schematic operations are shown as operations of the image reading control task 42, the LAN communication control task 43, and the PSTN communication control task 44 generated when the CPU 11 executes the program. These tasks may be operated by any control as long as the above-described general operation can be realized, but in the following, description will be made assuming that the tasks operate by control of the main control task.
Also, depending on the line status, the PSTN 25 may be faster than the LAN 35, or the PSTN 25 may have a shorter negotiation time than the LAN 35. However, here, it is assumed that the LAN 35 is faster and has a shorter negotiation time than the PSTN 25.

FIG. 4 is a block diagram illustrating a functional configuration example of the communication apparatus 50 that is virtually realized in the image processing apparatus 10 by the CPU 11 executing a program stored in the ROM 13 or the like.
As illustrated, the communication device 50 includes a main control unit 51, an image reading control unit 52, a LAN communication control unit 53, and a PSTN communication control unit 54.
The main control unit 51 corresponds to the main control task and controls the operations of the image reading control unit 52, the LAN communication control unit 53, and the PSTN communication control unit 54. Then, the data transmission speed of the LAN 35 and PSTN 25 is measured, or the data transmission speed is set when data is transmitted by the LAN 35 and PSTN 25. In the present embodiment, as an example of an acquisition unit that acquires a plurality of transmission rates, a first acquisition unit that acquires a first transmission rate, and a second acquisition unit that acquires a second transmission rate, Changing means for changing a transmission speed other than the slow specific transmission speed so as to approach the specific transmission speed; when the first transmission speed is slower than the second transmission speed, the second transmission speed is changed to the first transmission speed. The main control unit 51 is provided as an example of a changing unit that changes so as to approach.

The image reading control unit 52 corresponds to the image reading control task 42 and controls image reading by the image reading unit 14. Then, processing is performed so that the read image data is stored in the image storage memory 15. In the present embodiment, an image reading control unit 52 is provided as an example of a writing unit that writes image data into a storage unit.
The LAN communication control unit 53 corresponds to the LAN communication control task 43 and controls communication via the LAN 35 by the LAN I / F 16. In the present embodiment, a LAN communication control unit 53 is provided as an example of a transmission unit that transmits transmission target data or image data.
The PSTN communication control unit 54 corresponds to the PSTN communication control task 44 and controls communication via the PSTN 25 by the PSTNI / F 17. In the present embodiment, a PSTN communication control unit 54 is provided as an example of a transmission unit that transmits transmission target data or image data.
In the figure, the image storage memory 15 is provided outside the communication device 50. However, the image storage memory 15 may be provided inside the communication device 50, and this may be regarded as a storage unit in the communication device 50. Further, a memory that temporarily stores the image data read from the image storage memory 15 may be regarded as a storage unit in the communication device 50.

Next, the operation of such a communication device 50 will be described.
FIG. 5 is a flowchart illustrating an operation example of the communication device 50.
In the communication device 50, first, the main control unit 51 reads the image recorded on the recording medium by the image reading unit 14, and stores the read image data (image data) in the image storage memory 15 (step 501). Specifically, the image reading control unit 52 is instructed to read the image recorded on the recording medium. Thereby, the image reading control unit 52 controls the image reading unit 14 to read an image. The read image data is transferred to the main control unit 51, and the main control unit 51 stores the image data in the image storage memory 15.
Next, the main control unit 51 instructs the LAN communication control unit 53 and the PSTN communication control unit 54 to start negotiation, whereby the LAN communication control unit 53 and the PSTN communication control unit 54 start negotiation. (Step 502).

Thereafter, the main control unit 51 determines whether or not the end of the negotiation in the LAN 35 is notified from the LAN communication control unit 53 (step 503).
As a result, if it is not determined that the end of negotiation in the LAN 35 has been notified, step 503 is repeated. If it is determined that the end of negotiation in the LAN 35 has been notified, the image data stored in the image storage memory 15 is repeated. Is instructed to transmit to the LAN communication control unit 53 via the LAN 35 (step 504).

Thereafter, the main control unit 51 determines whether or not the end of the negotiation in the PSTN 25 is notified from the PSTN communication control unit 54 (step 505).
As a result, if it is not determined that the end of the negotiation in the PSTN 25 has been notified, it is determined whether or not 3 seconds have elapsed since the transmission of 1 byte in the step 504 (step 506). If 3 seconds have not elapsed, step 505 is repeated, but if 3 seconds have elapsed, the process returns to step 504 to transfer the next 1 byte of the image data stored in the image storage memory 15 via the LAN 35. The LAN communication control unit 53 is instructed to transmit.

Thus, in the LAN 35, 1-byte image data is transmitted at intervals of 3 seconds until the end of negotiation in the PSTN 25 is notified from the PSTN communication control unit 54. The transmission of 1-byte image data at an interval of 3 seconds is an example of transmitting a predetermined amount of data at a predetermined time as an amount necessary for maintaining the connection established previously. .
When it is determined in step 505 that the negotiation end in PSTN 25 has been notified, main control unit 51 receives information relating to data communication in LAN 35 from LAN communication control unit 53, and measures and stores the data transmission speed of LAN 35. At the same time, information related to data communication in the PSTN 25 is received from the PSTN communication control unit 54, and the data transmission speed of the PSTN 25 is measured and stored (step 507). In this case, since it is immediately after the end of the negotiation, the information related to the data communication may be a command related to the negotiation and information related to the response. The instruction related to the negotiation and the information related to the response are examples of information for establishing connections with a plurality of destinations.

  Thereafter, the slower data transmission speed stored here is determined as the subsequent data transmission speed of the LAN 35 and PSTN 25 (step 508). Then, the LAN communication control unit 53 is instructed to transmit the image data stored in the image storage memory 15 via the LAN 35 at the determined data transmission speed, and the image data stored in the image storage memory 15 is transmitted. The PSTN communication control unit 54 is instructed to transmit via the PSTN 25 at the determined data transmission rate (step 509). In this case, immediately after the end of the negotiation, the first few bytes of the image data have already been transmitted via the LAN 35, so that only untransmitted image data may be transmitted.

Next, the main control unit 51 determines whether there is an image to be read (step 510). Specifically, the image reading control unit 52 is inquired whether there is an image to be read, and this determination is performed based on a response from the image reading control unit 52.
As a result, when it is determined that there is an image to be read, the main control unit 51 reads the image recorded on the recording medium by the image reading unit 14, and stores the read image data (image data) in the image storage memory 15. Accumulate (step 511). Specifically, the image reading control unit 52 is instructed to read the image recorded on the recording medium. Thereby, the image reading control unit 52 controls the image reading unit 14 to read an image. The read image data is transferred to the main control unit 51, and the main control unit 51 accumulates the image data in the area where the transmitted image data of the image accumulation memory 15 was stored.

Thereafter, the process returns to step 507 again, and the main control unit 51 receives information related to data communication in the LAN 35 from the LAN communication control unit 53, measures and stores the data transmission speed of the LAN 35, and transmits data in the PSTN 25 from the PSTN communication control unit 54. Receives information related to communication, measures and stores the data transmission speed of the PSTN 25. In this case, since transmission of image data has started, information regarding transmission of image data and a response thereof may be used as information regarding data communication.
Thereafter, as described above, the main control unit 51 determines the slower data transmission speed among the stored data transmission speeds as the subsequent data transmission speed of the LAN 35 and the PSTN 25, and stores the image stored in the image storage memory 15. Data is transmitted via the LAN 35 and PSTN 25 at the determined data transmission rate.

  Thereafter, transmission of image data and accumulation of image data in the image accumulation memory 15 are repeated in the same manner. However, if it is determined in step 510 that there is no image to be read, the process ends.

In this embodiment, the LAN 35 and the PSTN 25 are exemplified as lines having different data transmission speeds, but the line types are not limited to these. In addition, this embodiment may be applied when the data transmission speed in one line type is different. For example, when transmitting to a plurality of destinations via the LAN 35, depending on the environment of the LAN 35, a slow line may be included on the way. In such a situation, the image data may be transmitted in parallel in accordance with the slow data transmission speed.
In the present embodiment, the data transfer speed other than the slowest data transfer speed is made to coincide with the slowest speed, but it is not always necessary to make them coincide. A data transfer speed other than the slowest data transfer speed may be changed to approach the slowest speed.

  The program for realizing the present embodiment can be provided not only by communication means but also by storing it in a recording medium such as a CD-ROM.

DESCRIPTION OF SYMBOLS 10, 20, 30 ... Image processing apparatus, 25 ... PSTN, 35 ... LAN, 50 ... Communication apparatus, 51 ... Main control part, 52 ... Image reading control part, 53 ... LAN communication control part, 54 ... PSTN communication control part

Claims (7)

First transmission means for transmitting data using a public network;
A second transmission means for transmitting data using a LAN;
Storage means for storing transmission target data that is a target of broadcast transmission to the first destination and the second destination ;
A first transmission speed, which is a transmission speed when data is transmitted to the first destination by the first transmission means, and a transmission speed when data is transmitted to the second destination by the second transmission means. Obtaining means for obtaining a second transmission speed of
Changing means for changing the higher transmission speed of the first transmission speed and the second transmission speed acquired by the acquisition means so as to approach the slower transmission speed;
With
The communication apparatus, wherein the first transmission unit or the second transmission unit transmits the transmission target data stored in the storage unit at a transmission rate changed by the changing unit. The first transmission unit or the second transmission unit is an amount necessary to maintain the connection with respect to a destination that has been established first among the first destination and the second destination. 2. The communication apparatus according to claim 1, wherein a predetermined amount of data is transmitted at a predetermined time until connection with both the first destination and the second destination is established. . The acquisition unit acquires the first transmission speed and the second transmission speed by calculation based on a transmission speed of information for establishing a connection with the first destination and the second destination. The communication apparatus according to claim 1 or 2, wherein The acquisition unit acquires the first transmission rate and the second transmission rate by calculation based on a transmission rate of the transmission target data by the first transmission unit and the second transmission unit. The communication device according to any one of claims 1 to 3. First transmission means for transmitting data using a public network;
A second transmission means for transmitting data using a LAN;
Storage means for storing transmission target data that is a target of broadcast transmission to the first destination and the second destination;
First acquisition means for acquiring a first transmission speed that is a transmission speed when data is transmitted to the first destination by the first transmission means ;
Second acquisition means for acquiring a second transmission speed, which is a transmission speed when data is transmitted to the second destination by the second transmission means ;
When the first transmission rate acquired by the first acquisition unit is slower than the second transmission rate acquired by the second acquisition unit, the second transmission rate is set to the first transmission rate. Change means for changing to approach the transmission speed of 1;
With
The first transmission unit and the second transmission unit transmit the transmission target data stored in the storage unit to the first destination at the first transmission speed, and store in the storage unit. A communication apparatus that performs transmission of the transmitted data to be transmitted to the second destination at the second transmission speed after being changed by the changing unit in parallel. Reading means for reading the image from the recording medium on which the image is recorded;
Writing means for writing the image data read by the reading means to the storage means as image data to be broadcasted to a plurality of destinations;
Obtaining means for obtaining a plurality of transmission speeds including a transmission speed at the time of transmitting data to each of the plurality of destinations;
Changing means for changing a transmission speed other than the slowest specific transmission speed among the plurality of transmission speeds acquired by the acquisition means so as to approach the specific transmission speed;
Transmission means for transmitting the image data written in the storage means by the writing means to the plurality of destinations in parallel at the plurality of transmission speeds changed by the changing means,
The writing unit writes the image data newly read by the reading unit into an area of the storage unit in which the image data transmitted by the transmission unit is stored. . On the computer,
A first transmission function for transmitting data using a public network;
A second transmission function for transmitting data using a LAN;
A storage function for storing, in a storage unit, transmission target data that is a target of broadcast transmission to the first destination and the second destination ;
A first transmission speed, which is a transmission speed when data is transmitted to the first destination by the first transmission function, and a transmission speed when data is transmitted to the second destination by the second transmission function An acquisition function for acquiring the second transmission speed ,
A change function for changing a higher transmission speed of the acquired first transmission speed and the second transmission speed so as to approach a slower transmission speed;
Realized ,
The first transmission function or the second transmission function transmits the transmission target data stored in the storage unit at a changed transmission speed .

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