JP7621038B2 - File distribution system, cloud device, and file distribution program - Google Patents

Description

The present invention relates to a file distribution system, and in particular to a file distribution system for distributing files from a cloud to all terminal devices at multiple locations.

Conventionally, when distributing files from cloud storage via the Internet, if all of the terminal devices to which the files are distributed retrieved the files from the Internet, the distribution of the files could take a long time depending on the level of Internet congestion.
To solve such problems, methods have already been proposed in which a file is distributed via the Internet to one terminal device within a network, such as within a company, and then the file is sent directly from this terminal device to other terminal devices within the network.

Incidentally, as described in Patent Document 1, when transmitting a large file, it is possible to reduce the overall time required for transmission to all terminal devices within a network by dividing the file and transmitting it.
However, when a file is divided and transmitted, it often happens that a portion of the file cannot be received.

JP 2021-47788 A JP 2012-53558 A JP 2002-124945 A JP 2018-55332 A

Specifically, for example, while receiving a file from a network terminal device located in Tokyo to one's own terminal device, it may become necessary to travel to another prefecture or the like with one's own terminal device.
In this case, the user is unable to properly use the file being received on his/her own terminal device during the business trip, and is forced to receive the file again after returning to Tokyo, which is a problem.

The inventors therefore conducted extensive research and discovered that it is possible to distribute files more efficiently by distributing the file via the Internet to a terminal device in another network in another prefecture, etc., and then enabling a terminal device that has completed file distribution in that network to directly receive the remainder of the file from the terminal device that is currently receiving the file.

Patent document 2 discloses a distribution system that includes multiple clients that can communicate with each other and a server that distributes files in response to distribution requests from each client, and when the server receives a request from each client to distribute an arbitrary file, it selects the client to which the arbitrary file has been distributed as a proxy server based on distribution history information that includes files that have already been distributed to the multiple clients and route information for the multiple clients to which the file is to be distributed, and transmits the route information of the proxy server to each client that has notified it of the distribution request, and each client transmits a distribution request for an arbitrary file held by the proxy server to the proxy server based on the route information transmitted from the server.

Patent Document 3 also discloses a system device that selects one representative client machine capable of receiving a distribution file from among multiple client machines for each subnet group, and sequentially multiplexes and distributes the distribution file to all selected representative client machines at a multiplicity that does not exceed the maximum allowable data multiplicity on the server transmission path, while each representative client machine in each subnet group distributes the distribution file received from the delivery server to the remaining client machines in the subnet group.

However, the systems described in these documents are not capable of solving the above-mentioned problems that arise when a file is divided and part of it cannot be received when it is sent, and they do not make it possible to prevent the need to retry receiving a file when a terminal device moves across different networks.

Furthermore, Patent Document 4 discloses a file distribution system having a function for dividing a file to be attached to a destination when a file in a table format is sent by operating a terminal device.
However, this system also does not make it possible to prevent the re-reception of a file when a terminal device moves across different networks.

Furthermore, Patent Document 1 discloses a file distribution system developed by the present inventor, and as mentioned above, proposes dividing a file in this system.
However, this document does not disclose a configuration that can prevent the need to receive a file again when a terminal device moves across different networks.

The present invention has been made in consideration of the above circumstances, and aims to provide a file distribution system, cloud device, and file distribution program that can reduce the amount of file distribution to terminal devices via the Internet, prevent the need to receive files again when a terminal device moves across different networks, and efficiently distribute files.

In order to achieve the above object, the file distribution system of the present invention is a file distribution system that distributes files in a cloud device to a plurality of terminal devices, the cloud device includes a file storage unit that stores files, a target storage unit that stores information on the terminal devices to which the files are to be distributed, a distribution processing unit that performs file distribution processing, a notification unit that notifies the access information of the terminal devices to which the files are to be distributed, and an update unit that updates the information on the terminal devices to which the files are to be distributed in the target storage unit, the target storage unit stores access information on the terminal devices to which the files are to be distributed belonging to each base, and distribution status information indicating whether distribution has been completed for each file for the terminal devices to which the files are to be distributed, and when the distribution processing unit receives a request to send a file from the terminal device to which the files are to be distributed, it transmits the file in the file storage unit to the terminal device to which the files are to be distributed, and the notification unit updates the information on the terminal devices to which the files are to be distributed in accordance with other file distribution requests. When the notification unit receives an inquiry about the distribution completion terminal device from the terminal device to which the other file is distributed, the notification unit selects from the target storage unit a distribution completion terminal device at the base to which the other file distribution target terminal device belongs, and transmits access information for the selected distribution completion terminal device to the other file distribution target terminal device; if the other file distribution target terminal device is moved to a different base while receiving part of the file, when the notification unit receives an inquiry about the distribution completion terminal device again from the terminal device to which the other file is distributed, the notification unit selects from the target storage unit a distribution completion terminal device at the destination base to which the other file distribution target terminal device belongs, and transmits access information for the selected distribution completion terminal device to the other file distribution target terminal device; and the other file distribution target terminal device receives the remainder of the file from the selected distribution completion terminal device at the destination base.

In addition, it is preferable that the file distribution system of the present invention is configured such that the base and the destination base are networks in which terminal devices belonging to each base cannot directly communicate with terminal devices belonging to the other base without going through the Internet.

The file distribution system of the present invention is preferably configured such that the distribution processing unit selects one terminal device to which the file is to be distributed for each base from the target storage unit, transmits a file acquisition request to the selected terminal device to which the file is to be distributed, and, upon receiving a file transmission request from the selected terminal device to which the file is to be distributed, transmits the file in the file storage unit to the selected terminal device to which the file is to be distributed.

The file distribution system of the present invention is preferably configured such that, when the update unit receives a distribution completion notification from the terminal device to which the other file is distributed, the target storage unit stores distribution status information indicating that distribution to the terminal device to which the other file is distributed has been completed.

In addition, the file distribution system of the present invention is preferably configured such that, when the notification unit receives an inquiry about a distribution-completed terminal device from a terminal device to which the further other file is distributed, the notification unit selects from the target storage unit the terminal device to which the file is distributed or the other terminal device to which the file is distributed, for which distribution status information indicating that distribution has been completed is stored in the target storage unit, as a distribution-completed terminal device at the base to which the further other file is distributed, and transmits access information to the selected distribution-completed terminal device to the further other file distribution target terminal device, and when the update unit receives a distribution completion notification from the terminal device to which the further other file is distributed, the update unit stores in the target storage unit distribution status information indicating that distribution has been completed for the terminal device to which the further other file is distributed.

The cloud device of the present invention is a cloud device that distributes files to a plurality of terminal devices, and includes a file storage unit that stores files, a target storage unit that stores information about the terminal devices to which the files are to be distributed, a distribution processing unit that performs file distribution processing, a notification unit that notifies the access information of the distribution-completed terminal devices, and an update unit that updates the information about the distribution-completed terminal devices in the target storage unit, and the target storage unit stores the access information of the terminal devices to which the files are to be distributed belonging to each base, and the distribution status information indicating whether or not distribution has been completed for each file for the terminal devices to which the files are to be distributed, and the distribution processing unit selects one terminal device to which the files are to be distributed from the target storage unit for each base, transmits a file acquisition request to the selected terminal device to which the files are to be distributed, and when a file transmission request is received from the selected terminal device to which the files are to be distributed, updates the file. The file in the file storage unit is sent to the selected terminal device to which the file is to be distributed, and when the notification unit receives an inquiry about the distribution-completed terminal device from the terminal device to which the other file is to be distributed, the notification unit selects the distribution-completed terminal device at the base to which the other file is to be distributed from the target storage unit and sends access information to the other file distribution target terminal device, and when the other file distribution target terminal device is moved to a different base while receiving part of the file, when the notification unit receives an inquiry about the distribution-completed terminal device from the terminal device to which the other file is to be distributed again, the notification unit selects the distribution-completed terminal device at the base to which the other file distribution target terminal device belongs from the target storage unit and sends access information to the selected distribution-completed terminal device to the other file distribution target terminal device.

The file distribution program of the present invention is a file distribution program for distributing files to a plurality of terminal devices, and causes a computer to function as a file storage unit for storing files, a target storage unit for storing information on terminal devices to which the files are to be distributed, a distribution processing unit for performing file distribution processing, a notification unit for notifying access information on terminal devices to which distribution has been completed, and an update unit for updating information on terminal devices to which distribution has been completed in the target storage unit, and causes the target storage unit to store access information on terminal devices to which the files are to be distributed that belong to each base, and distribution status information indicating whether distribution has been completed for each file for the terminal devices to which the files are to be distributed, and causes the distribution processing unit to select one terminal device to which the files are to be distributed for each base from the target storage unit, and to transmit a file acquisition request to the selected terminal device to which the files are to be distributed, and causes the selected terminal device to which the files are to be distributed to transmit a file transmission request to the terminal device to which the files are to be distributed. When a file is received, the file is transmitted from the file storage unit to the selected terminal device to which the file is to be distributed, and when a query for a distribution-completed terminal device is transmitted from the terminal device to which the other file is to be distributed to the notification unit, the file storage unit selects a distribution-completed terminal device at the base to which the other file is to be distributed from the target storage unit and transmits access information for the selected distribution-completed terminal device to the other file distribution target terminal device. When the terminal device to which the other file is to be distributed is moved to a different base while receiving a portion of the file and a query for a distribution-completed terminal device is transmitted again from the terminal device to which the other file is to be distributed, the notification unit selects a distribution-completed terminal device at the base to which the other file distribution target terminal device belongs from the target storage unit and transmits access information for the selected distribution-completed terminal device to the other file distribution target terminal device.

The present invention makes it possible to provide a file distribution system, cloud device, and file distribution program that can reduce the amount of file distribution to terminal devices via the Internet, prevent the need to receive files again when a terminal device moves across different networks, and efficiently distribute files.

FIG. 2 is an explanatory diagram showing file distribution to one terminal device per base in the file distribution system according to the embodiment of the present invention. 1 is an explanatory diagram of file reception by a terminal device at each base in a file distribution system according to an embodiment of the present invention. FIG. 1 is an explanatory diagram of file reception by a terminal device when the terminal device moves between bases in a file distribution system according to an embodiment of the present invention. FIG. 1 is an explanatory diagram showing the proliferation of distribution-completed terminal devices in a file distribution system according to an embodiment of the present invention. 1 is a block diagram showing a configuration of a file distribution system according to an embodiment of the present invention. 1 is a flowchart showing a file distribution processing procedure in a file distribution system according to an embodiment of the present invention.

The following describes in detail embodiments of the file distribution system, cloud device, and file distribution program of the present invention. However, the present invention is not limited to the specific contents of the following embodiments.

First, an overview of the processing performed by a file distribution system according to an embodiment of the present invention will be described with reference to FIGS.
As shown in FIG. 1, the file distribution system of this embodiment includes a cloud device 10 and a plurality of personal computers (PCs, terminal devices) 20 (20(1) to 20(3), etc.).
In FIG. 1, personal computers 20(1) and 20(3) exist within the network at site A, and personal computer 20(2) exists within the network at site B.

For example, site A is a network of an office in Tokyo, site B is a network of an office in Osaka, and a firewall is constructed in each network.
As a result, a personal computer in the network of site A and a personal computer in the network of site B can no longer communicate directly with each other's IP address using TCP or UDP.
In other words, in this embodiment, bases A and B refer to networks in which terminal devices belonging to each base cannot communicate directly with terminal devices belonging to the other base without going through the Internet, and a base unit refers to each of these networks.

The cloud device 10 includes a management server 11 and a storage 12, and the storage 12 stores files to be distributed.
The management server 11 first requests one personal computer per base to acquire a file via the Internet.

1, a file acquisition request is sent from management server 11 to computer 20(1) at site A and computer 20(2) at site B, and these computers acquire the file from storage 12 via the Internet. At this time, as an example, a case is shown in which each computer acquires the entire file by dividing it into three parts.
Management server 11 stores information that file distribution to personal computer 20(1) and personal computer 20(2) is complete. Hereinafter, such a personal computer to which file distribution has been completed may be referred to as a "distribution completed personal computer"("distribution completed terminal device").

Next, as shown in FIG. 2, another personal computer 20(3) at site A begins to receive the file, and at this time inquires of the management server 11 about the existence of any personal computers within site A to which the personal computer 20(3) belongs that have completed distribution of the file.
Management server 11 notifies personal computer 20(3) that file distribution to personal computer 20(1) has been completed.

Therefore, PC 20(3) attempts to receive the file directly from PC 20(1). Note that because the file is divided into three parts, PC 20(3) attempts to obtain each part from PC 20(1).
First, assume that PC 20(3) successfully acquires file 1/3 from PC 20(1).
If, for some reason, personal computer 20(3) is moved between locations in the middle of receiving the file, it will no longer be able to receive the file from personal computer 20(1).

As shown in FIG. 3, when PC 20(3) moves from location A to location B, PC 20(3) inquires of management server 11 about the existence of a PC at location B to which file distribution has been completed.
The management server 11 notifies the personal computer 20(3) that the file distribution to the personal computer 20(2) has been completed.

Therefore, PC 20(3) attempts to receive the file directly from PC 20(2).
Here, since personal computer 20(3) has already acquired file 1/3 from personal computer 20(1), it acquires files 2/3 and 3/3 from personal computer 20(2).

In this way, even if the personal computer 20(3) moves across different networks, it is possible to start receiving the file from the middle without having to start receiving 1/3 of the file again, and it is possible to avoid repeating unnecessary file acquisition.
In other words, according to the file distribution system of this embodiment, even if a personal computer is moved between locations while a file is being received, the file can be received from where it left off, and the remaining file data can be received from a personal computer other than the one that was previously receiving the file.

In addition, in the file distribution system of this embodiment, the computers at the base are on a network that can directly connect to each other, so files can be sent and received by packet communication using UDP. Because UDP is connectionless, it is possible to transfer files while reducing the load on the computers.

In this way, according to the file distribution system of this embodiment, only one personal computer at each base receives files from storage 12 via the Internet, and other personal computers at the base do not receive files from storage 12, but instead obtain the files from the personal computer at the base that has completed distribution, thereby reducing the burden on personal computers to receive files from storage 12 via the Internet.
Furthermore, even if the personal computer moves across different networks while receiving a file, it can receive only the remainder of the file without having to redo the already received file, eliminating the need to repeatedly and unnecessarily obtain the file.

Next, the proliferation of distribution-completed personal computers in the file distribution system of this embodiment will be described with reference to FIG.
When PC 20(3) has completed receiving the file, it transmits a notification of the completion of distribution to management server 11. Management server 11 records the completion of the distribution of the file to PC 20(3).

Next, when PC 20(4) at base B inquires of management server 11 about the existence of any PCs at base B to which file distribution has been completed, to which management server 11 belongs, can notify PC 20(4) that file distribution has been completed to PC 20(3).
Then, personal computer 20(4) receives the file from personal computer 20(3), and when the file reception is complete, it sends a notification of the completion of distribution to management server 11. Management server 11 stores the fact that the distribution of the file to personal computer 20(4) is completed.

Similarly, when PC 20(5) at base B inquires of management server 11 about the existence of any PCs at base B to which file distribution has been completed, to which management server 11 belongs, can notify PC 20(5) that file distribution has been completed from PC 20(2).
Then, personal computer 20(5) receives the file from personal computer 20(2), and when the file reception is complete, it sends a notification of the completion of distribution to management server 11. Management server 11 stores the fact that the distribution of the file to personal computer 20(5) is completed.

In this way, in the file distribution system of this embodiment, by having the management server 11 record newly completed computers to which files have been distributed, the number of completed computers notified by the management server 11 to the computers 20 at each base can be increased exponentially, from one to two, four, eight, and so on.
This makes it possible to prevent a specific personal computer at each location from making simultaneous file reception requests from many personal computers.
Furthermore, in the file distribution system of this embodiment, by increasing the number of distribution-completed personal computers to which files can be transmitted, file distribution can be performed more efficiently.

Next, the configuration of the file distribution system of this embodiment will be described in detail with reference to FIG.
The file distribution system of this embodiment is a file distribution system that distributes files in a cloud device to multiple terminal devices, and includes a cloud device 10, multiple personal computers 20 (20(1) to 20(3)), and a communication line 30 such as the Internet that connects them. The personal computers 20 are information processing devices such as personal computers and smartphones. Although three personal computers 20 are shown in FIG. 5, the number of personal computers 20 is not particularly limited.

The cloud device 10 includes a management server 11 and a storage 12 .
The management server 11 comprises a target storage unit 111 for storing information on terminal devices that are targets of file distribution, a distribution processing unit 112 for performing file distribution processing, a notification unit 113 for notifying access information on distribution-completed terminal devices, and an update unit 114 for updating the information on distribution-completed terminal devices in the target storage unit 111. The management server 11 also comprises a transmission/reception unit 115 for transmitting and receiving information to and from the personal computer 20 via the communication line 30.
The storage 12 includes a file storage unit 121 for storing files.

The target storage unit 111 stores access information for the terminal devices to which the files are to be distributed, which belong to each base, and distribution status information indicating whether or not the distribution of each file to the terminal devices to which the files are to be distributed has been completed. For example, an IP address or a URL (Uniform Resource Locator) can be used as the access information.
When the distribution processing unit 112 receives a request to send a file from a terminal device to which the file is to be distributed, the distribution processing unit 112 transmits the file in the file storage unit 121 to the terminal device to which the file is to be distributed.

In addition, prior to the processing, the distribution processing unit 112 can select one terminal device to which the file is to be distributed for each base station from the target memory unit 111, and send a request to obtain the file to the selected terminal device to which the file is to be distributed.
Then, when the distribution processing unit 112 receives a request to send a file from the selected terminal device to which the file is to be distributed, the distribution processing unit 112 can transmit the file in the file storage unit 121 to the selected terminal device to which the file is to be distributed.

When the notification unit 113 receives an inquiry about a distribution-completed terminal device from a terminal device that is another file distribution target, the notification unit 113 selects a distribution-completed terminal device at the base to which the other file distribution target terminal device belongs from the target storage unit 111, and transmits access information for the selected distribution-completed terminal device to the other file distribution target terminal device.

If a terminal device to which another file is to be distributed is moved to a different base while receiving (downloading) part of the file, the notification unit 113, upon receiving another inquiry about the distribution-completed terminal device from the terminal device to which the other file is to be distributed, selects from the target memory unit 111 the distribution-completed terminal device at the destination base to which the other terminal device to which the file is to be distributed belongs, and transmits access information for the selected distribution-completed terminal device to the other terminal device to which the file is to be distributed.
The other terminal devices to which the file is to be distributed then receive the remaining part of the file from the selected distribution-completed terminal device at the destination base.

In addition, when the update unit 114 receives a distribution completion notification from another terminal device to which the file is to be distributed, it stores in the target memory unit 111 distribution status information indicating that distribution to the other terminal device to which the file is to be distributed has been completed.
This makes it possible for the notification section 113 to select, as a distribution-completed terminal device, a terminal device that is a target of other file distribution, when receiving an inquiry about the distribution-completed terminal device.

Furthermore, when the notification unit 113 receives an inquiry about a distribution-completed terminal device from a terminal device to which the further other file is to be distributed, the notification unit 113 can select from the target storage unit 111 a terminal device to which the file is to be distributed and for which distribution status information indicating that distribution is complete is stored in the target storage unit 111 or a terminal device to which the file is to be distributed as a distribution-completed terminal device at the base to which the further other file is to be distributed, and transmit access information for the selected distribution-completed terminal device to the further other file distribution target terminal device.

Then, when the update unit 114 receives a distribution completion notification from a further terminal device to which the file is to be distributed, it stores in the target memory unit 111 distribution status information indicating that distribution to the further terminal device to which the file is to be distributed has been completed.
In this way, according to the file distribution system of this embodiment, the number of distribution-completed terminal devices that can be selected by the notification unit 113 can be increased, making it possible to distribute files efficiently.

Next, a file distribution process procedure in the file distribution system of this embodiment will be described with reference to FIG.
First, the cloud device 10 transmits a file acquisition request to the personal computer 20(1) at site A, which is selected as a terminal device to which one file is to be distributed for each site (step 10).

The personal computer 20(1) receives (downloads) the file from the cloud device 10 (step 11), and upon completion of the file reception, notifies the cloud device 10 that the distribution of the file to the personal computer 20(1) is complete (step 12).
The cloud device 10 updates the distribution status information in the object storage unit 111 to indicate that distribution of the file to the personal computer 20(1) has been completed (step 13).

In the same manner, the cloud device 10 sends a request to acquire the file to the personal computer 20 (2) at site B, which has been selected as the terminal device to which the file is to be distributed for each site (step 14).

PC 20(2) receives the file from cloud device 10 (step 15), and upon completion of the file reception, notifies cloud device 10 that distribution of the file to PC 20(2) is complete (step 16).
The cloud device 10 updates the distribution status information in the object storage unit 111 to indicate that distribution of the file to the personal computer 20(2) has been completed (step 17).

Next, the personal computer 20(3) at the site A transmits an inquiry about the distribution completion terminal device at the site A to the cloud device 10 (step 18).
The cloud device 10 selects the personal computer 20(1) as the distribution completion terminal device at the site A to which the personal computer 20(3) belongs, and notifies the personal computer 20(3) of this (step 19).
PC 20(3) attempts to receive the file from PC 20(1) and successfully receives a portion of the file (step 20).

Next, while the personal computer 20(3) is receiving the file, for some reason it is moved from location A to location B (step 21).
The personal computer 20(3) transmits an inquiry about the distribution completion terminal device at site B to the cloud device 10 (step 22).
The cloud device 10 selects the personal computer 20(2) as the distribution completion terminal device at the site B to which the personal computer 20(3) belongs, and notifies the personal computer 20(3) of this (step 23).

Personal computer 20(3) attempts to receive the file from personal computer 20(2) and receives the remainder of the file (step 24).
When the personal computer 20(3) has completed receiving the file, it notifies the cloud device 10 that the distribution of the file to the personal computer 20(3) has completed (step 25).
The cloud device 10 updates the distribution status information in the object storage unit 111 to indicate that distribution of the file to the personal computer 20(3) has been completed (step 26).

The cloud device 10 in the above embodiment can be realized using a computer controlled by a program. The computer's CPU sends commands to each component of the computer based on the program, causing them to perform predetermined processes required for the operation of the cloud device 10, such as sending a file acquisition request, updating distribution status information, and notifying a terminal device that distribution has been completed. In this way, each process and operation in the cloud device 10 of the present invention can be realized by specific means in which the program and the computer work together.

The program is stored in advance in a recording medium such as a ROM or RAM, and is executed by having the computer read the program from the recording medium installed in the computer. However, the program can also be read into the computer via a communication line, for example.
Furthermore, the recording medium for storing the program can be configured by any recording means readable by any computer, such as a semiconductor memory, a magnetic disk, an optical disk, or the like.

As described above, according to the file distribution system, cloud device, and file distribution program of this embodiment, even if the terminal device moves across different networks while receiving a file, it is possible to receive the remaining file data from a PC other than the PC that was previously receiving the file, thereby eliminating the need to repeatedly and unnecessarily obtain the file.

Furthermore, since only one computer at each location receives the file via the Internet, and other computers at the location can obtain the file from the computer on which distribution has been completed, the burden on computers to receive files via the Internet can be reduced.
Furthermore, it is possible to prevent a specific PC at each location from making simultaneous file reception requests from many PCs, and by increasing the number of PCs that have completed distribution and are able to send files, it is possible to distribute files more efficiently.

The present invention is not limited to the above-described embodiment, and it goes without saying that various modifications can be made within the scope of the present invention.
For example, although the embodiment has been described using a case where there are two bases, the present invention can be applied to a case where there are more bases. Also, the number of terminal devices and the number of files at each base of the file distribution system can be changed as appropriate.

The present invention can be used effectively in situations where it is necessary to distribute large files in a work environment where work is carried out using terminal devices in various locations across different networks.

10 Cloud device 11 Management server 111 Target storage unit 112 Distribution processing unit 113 Notification unit 114 Update unit 115 Transmission/reception unit 12 Storage 121 File storage unit 20 (1) to 20 (5) Personal computer (terminal device, PC)

Claims (4)

A file distribution system that distributes files in a cloud device to a plurality of terminal devices,
the cloud device comprises a file storage unit for storing a file, a target storage unit for storing information on a terminal device to which the file is to be distributed, a distribution processing unit for performing a process of distributing the file, a notification unit for notifying access information on a distribution-completed terminal device, and an update unit for updating the information on the distribution-completed terminal device in the target storage unit;
the target storage unit stores access information for a terminal device to which a file is to be distributed that belongs to each base, and distribution status information indicating whether or not distribution of each file to the terminal device to which the file is to be distributed has been completed;
when the distribution processing unit receives a file transmission request from a terminal device to which the file is to be distributed, the distribution processing unit transmits the file in the file storage unit to the terminal device to which the file is to be distributed;
When the notification unit receives an inquiry about a distribution completion terminal device from a terminal device to which the other file is to be distributed, the notification unit selects a distribution completion terminal device at a base to which the other file is to be distributed from the target storage unit, and transmits access information for the selected distribution completion terminal device to the other file distribution target terminal device;
when the terminal device to which the other file is to be distributed is moved to a different base while receiving a part of the file, when the notification unit receives an inquiry about a distribution completion terminal device from the terminal device to which the other file is to be distributed again, the notification unit selects a distribution completion terminal device at the destination base to which the terminal device to which the other file is to be distributed belongs from the target storage unit, and transmits access information for the selected distribution completion terminal device to the terminal device to which the other file is to be distributed;
the other terminal device to which the file is to be distributed receives the remainder of the file from the selected distribution-completed terminal device at the destination base ;
the distribution processing unit selects one terminal device to which the file is to be distributed for each base from the target storage unit, and transmits a file acquisition request to the selected terminal device to which the file is to be distributed;
When a file transmission request is received from the selected terminal device to which the file is to be distributed, the file in the file storage unit is transmitted to the selected terminal device to which the file is to be distributed.
A file distribution system comprising: 2. The file distribution system according to claim 1, wherein the base and the destination base are networks in which terminal devices belonging to each base cannot directly communicate with terminal devices belonging to the other base without going through the Internet. The file distribution system described in claim 1 or 2, characterized in that when the update unit receives a distribution completion notification from the other terminal device to which the file is distributed, it stores distribution status information indicating that distribution to the other terminal device to which the file is distributed has been completed in the target memory unit. When the notification unit receives an inquiry about a distribution-completed terminal device from a terminal device to which the further other file is to be distributed, the notification unit selects from the target storage unit a terminal device to which the file is to be distributed and for which distribution status information indicating that distribution has been completed is stored in the target storage unit or a terminal device to which the further other file is to be distributed, as a distribution-completed terminal device at a base to which the terminal device to which the further other file is to be distributed belongs, and transmits access information for the selected distribution-completed terminal device to the terminal device to which the further other file is to be distributed;
The file distribution system described in claim 1 or 2, characterized in that when the update unit receives a distribution completion notification from the terminal device to which the further other file is distributed, it stores distribution status information indicating that distribution to the terminal device to which the further other file is distributed has been completed in the target memory unit.

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