JP6597315B2 - File synchronization system, terminal device, file synchronization method, and file synchronization program - Google Patents

Description

  The present invention relates to a file synchronization system, a terminal device, a file synchronization method, and a file synchronization program.

  With the spread of smartphones and tablet terminals, service providers that provide storage services using the Internet are increasing. This storage service is a web service that enables the use of a storage area reserved for each user by performing user authentication using account information registered in advance by the user. Patent Documents 1 and 2 describe systems that use such storage services.

  Patent Document 1 discloses two NAS (Network Attached Storage) and DDNS (Dynamic Domain Name System) services as storage devices for storing various files such as document files, sound files, image files, and moving image files. A system is described in which a DDNS server that provides a storage service and a service server that provides a storage service are connected via the Internet.

  In the system described in Patent Document 1, communication between two NAS is performed using a DDNS server to prepare for file synchronization between NAS. Specifically, when the DDNS server receives a notification of an IP address or the like from one of the two NASs, the DDNS server notifies this IP address to the other of the two NASs. Then, preparation for file synchronization is performed by direct communication between the two NAS using this IP address.

  After completion of this preparation, the file stored in one of the two NASs is stored in the service server, and this file stored in the service server is acquired and stored by the other of the two NASs. Synchronization is done.

  Patent Document 2 describes a system in which a plurality of terminal devices and a service server that provides a storage service are connected via the Internet.

  In the system described in Patent Document 2, each terminal device and the service server are provided with a synchronous storage area. When a file stored in the synchronous storage area of an arbitrary terminal device is changed, the change is made. Synchronously, the file in the synchronous storage area of the service server is changed. Then, in synchronization with the change of the file of the service server, the file of the synchronous storage area of the other terminal device is changed.

JP 2014-099054 A JP, 2015-207081, A

  As in the systems described in Patent Documents 1 and 2, a storage service is used to operate a plurality of NAS in a group such as a company or a school, and the plurality of NAS are arranged in a remote place. However, data synchronization and data backup among a plurality of NAS can be easily realized.

  However, in the method in which each terminal device synchronizes with the file stored in the service server as in Patent Document 2, when the file stored in the service server is falsified by a malicious person, each terminal device An unintended file may be stored in the device.

  In order to avoid such a situation, as in Patent Document 1, it is effective to perform file synchronization after forming an agreement in advance about file synchronization between terminal devices. However, the system described in Patent Document 1 requires a DDNS server in order to perform direct communication between terminal devices, which increases the cost of the entire system.

  The present invention has been made in view of the above circumstances, and a file synchronization system, a terminal device, a file synchronization method, and a file synchronization that can realize file synchronization between a plurality of terminal devices at low cost and safely. The purpose is to provide a program.

  The file synchronization system of the present invention includes a first terminal device having a first storage unit in which a synchronization target file is stored, a second terminal device having a second storage unit, and a first network. A service providing device configured to be communicable with the first terminal device and the second terminal device, and including a storage area allocated to the first terminal device and the second terminal device; The first terminal apparatus performs control for storing a transmission file including the synchronization target file and predetermined identification information in the storage area of the service providing apparatus. The second terminal device receives a file stored in the storage area of the service providing device by a device other than the own device from the service providing device. And a storage control unit that, when the file acquired by the download unit is the transmission file, stores a synchronization target file included in the transmission file in the second storage unit. It is.

  The terminal device of the present invention is a terminal device having a first storage unit in which a synchronization target file is stored, and a transmission file including the synchronization target file and predetermined identification information An upload unit configured to be communicable with a plurality of the terminal devices via a network and performing control to be stored in the storage area of a service providing apparatus including a storage area allocated to the plurality of terminal apparatuses; A download unit that acquires a file stored in the storage area of the service providing device by a device other than its own device from the service providing device, and when the file acquired by the download unit is the transmission file, the transmission file A synchronization processing unit that performs processing for storing the synchronization target file included in the first storage unit Than is.

  In the file synchronization method of the present invention, a terminal device having a first storage unit in which a synchronization target file is stored stores a transmission file including the synchronization target file and predetermined identification information on a first network. And is configured to be communicable with a plurality of the terminal devices via the network, and to store in the storage area of the service providing apparatus including a storage area allocated to the plurality of terminal apparatuses. When a file stored in the storage area by a device other than its own device is acquired from the service providing device, and the acquired file is the transmission file, the synchronization target file included in the transmission file is the first file Processing for storing in the storage unit is performed.

  The file synchronization program of the present invention provides a terminal device having a first storage unit in which a synchronization target file is stored, a transmission file including the synchronization target file and predetermined identification information, a first network An upload step for performing control to store in the storage area of a service providing apparatus including a storage area allocated to the plurality of terminal apparatuses and configured to be communicable with the plurality of terminal apparatuses via the network; and A download step for acquiring a file stored in the storage area of the device other than its own device from the service providing device, and when the file acquired by the download step is the transmission file, the file is included in the transmission file A process for storing the synchronization target file in the first storage unit. A processing step is for to run.

  According to the present invention, it is possible to provide a file synchronization system, a terminal device, a file synchronization method, and a file synchronization program that can realize file synchronization among a plurality of terminal devices at low cost and safely.

It is a figure which shows schematic structure of the file synchronization system 100 which is one Embodiment of this invention. It is a figure which shows the example of an internal structure of 1 A of 1st information appliances in the file synchronization system 100 shown in FIG. It is a figure which shows the internal structural example of the 2nd information apparatus 1B in the file synchronization system 100 shown in FIG. It is a figure which shows the internal structural example of 1st NAS2A in the file synchronization system 100 shown in FIG. It is a figure which shows the internal structural example of 2nd NAS2B in the file synchronization system 100 shown in FIG. It is a figure which shows the example of an internal structure of the service provision apparatus 7 in the file synchronization system 100 shown in FIG. It is a functional block diagram of CPU30 of 1st NAS2A shown in FIG. It is a functional block diagram of CPU30 of 2nd NAS2B shown in FIG. 3 is a flowchart for explaining an operation when the folder C of the first NAS 2A and the folder C of the second NAS 2B are synchronized in the file synchronization system 100 shown in FIG. 3 is a flowchart for explaining an operation when the folder C of the first NAS 2A and the folder C of the second NAS 2B are synchronized in the file synchronization system 100 shown in FIG. 2 is a flowchart for explaining an operation in the case where synchronization between the folder B of the second NAS 2B and the folder B of the first NAS 2A is performed in the file synchronization system 100 shown in FIG. 2 is a flowchart for explaining an operation in the case where synchronization between the folder B of the second NAS 2B and the folder B of the first NAS 2A is performed in the file synchronization system 100 shown in FIG. 7 is a flowchart for explaining a modification of the operation of the file synchronization system 100 shown in FIG. 1.

  Embodiments of the present invention will be described below with reference to the drawings.

  FIG. 1 is a diagram showing a schematic configuration of a file synchronization system 100 according to an embodiment of the present invention.

  The file synchronization system 100 includes a first information device 1A, a second information device 1B, a first NAS 2A constituting the first terminal device or terminal device, and a second terminal device or terminal device constituting the second terminal device or terminal device. A second NAS 2B, a first router 5A, a second router 5B, and a service providing device 7 operated by a service provider that provides a web service for storing files. In the file synchronization system 100, the first NAS 2A and the second NAS 2B are managed by the same administrator.

  The first information device 1 </ b> A and the first NAS 2 </ b> A are connected to a first LAN (Local Area Network) 3 used in a company, a school, or a private residence, and are mutually connected via the first LAN 3. Can communicate. The first LAN 3 constitutes a second network.

  The first LAN 3 is connected to the Internet 6 via the first router 5A. Accordingly, the first information device 1A and the first NAS 2A can be connected to the Internet 6 constituting the first network.

  The first information device 1A is an electronic device having a network communication function for performing network communication, a display unit, and an operation interface (I / F) such as a keyboard, a mouse, or a touch panel. For example, a personal computer, a tablet terminal, or a smartphone is used as the first information device 1A.

  The first information device 1A is registered in advance with the first NAS 2A, edits the file stored in the first NAS 2A via the first LAN 3, and reads the file to the first NAS 2A. Storage and file reading from the first NAS 2A can be performed.

  Registration information such as the user name and password of the first information device 1A is registered by performing a registration operation from the first information device 1A to the first NAS 2A. Alternatively, this registration information is registered in advance in an authentication server connected to the first LAN 3. In this case, when there is access to the first NAS 2A from the first information device 1A, the first NAS 2A acquires the registration information of the first information device 1A from the authentication server, whereby the first information device 1A Authenticate 1A.

  The first NAS 2A is a file server specialized for file storage and management, and includes a file system for performing file management and a network communication function for performing network communication.

  A plurality of first information devices 1A may be registered in the first NAS 2A, and a file may be stored, edited, and read by each of the plurality of first information devices 1A.

  The second information device 1B and the second NAS 2B are connected to a second LAN 4 different from the first LAN 3, and can communicate with each other via the second LAN 4. The second LAN 4 may be the same network as the first LAN 3. The second LAN 4 constitutes a second network.

  The second LAN 4 is connected to the Internet 6 via the second router 5B. Accordingly, the second information device 1B and the second NAS 2B can be connected to the Internet 6 constituting the first network.

  The second information device 1B is an electronic device having a network communication function for performing network communication, a display unit, and an operation interface (I / F) such as a keyboard, a mouse, or a touch panel. For example, a personal computer, a tablet terminal, or a smartphone is used as the second information device 1B.

  The second information device 1B is pre-registered with respect to the second NAS 2B, edits the file stored in the second NAS 2B via the second LAN 4, and edits the file to the second NAS 2B. Storage and file reading from the second NAS 2B can be performed.

  Registration information such as the user name and password of the second information device 1B is registered by performing a registration operation from the second information device 1B to the second NAS 2B. Alternatively, this registration information is registered in advance in an authentication server connected to the second LAN 4. In this case, when the second NAS 2B is accessed from the second information device 1B, the second NAS 2B obtains the registration information of the second information device 1B from the authentication server, whereby the second information device 1B 1B authentication is performed.

  The second NAS 2B is a file server specialized for file storage and management, and includes a file system for performing file management and a network communication function for performing network communication.

  A plurality of second information devices 1B may be registered in the second NAS 2B, and a file may be stored, edited, and read by each of the plurality of second information devices 1B.

  The service providing device 7 is connected to the Internet 6 and is composed of one or more file servers having a third storage unit such as a hard disk drive or a solid state drive.

  The service provided by the service providing apparatus 7 is a web service in which a user registered in advance can store a file in these third storage units via the Internet 6.

  The service providing apparatus 7 is used by the administrator of the first NAS 2A and the second NAS 2B by registering an account identified by a user name, a password, and the like (hereinafter referred to as user registration) in the web service. Provide the administrator with possible storage space. In the file synchronization system 100, it is assumed that the administrators of the first NAS 2A and the second NAS 2B have already been registered with the web service.

  That is, the first NAS 2A and the second NAS 2B access the service providing apparatus 7 via the Internet 6, and the storage areas (the storage areas allocated to the first NAS 2A and the second NAS 2B in the service providing apparatus 7 ( Hereinafter, the file can be stored in the NAS storage area).

  FIG. 2 is a diagram showing an internal configuration example of the first information device 1A in the file synchronization system 100 shown in FIG.

  The first information device 1A includes a CPU (Central Processing Unit) 20, a ROM (Read Only Memory) 21, a RAM (Random Access Memory) 22, a liquid crystal driver 230, a liquid crystal panel 231, a LAN module 240, a keyboard, a mouse, or An operation interface (I / F) 260 such as a touch panel integrated with the liquid crystal panel 231, an internal storage unit 27, a USB (Universal Serial Bus) controller 280, and a USB connector 281 are provided.

  The CPU 20, ROM 21, RAM 22, liquid crystal driver 230, LAN module 240, operation interface 260, internal storage unit 27, and USB controller 280 are connected by a common bus.

  The CPU 20 controls the operation of the entire first information device 1 </ b> A by being executed after a program such as firmware stored in the ROM 21 is expanded in the RAM 22.

  The ROM 21 stores programs such as the firmware and various setting data. The RAM 22 operates as a work memory of the first information device 1A, and temporarily stores various programs and data.

  The liquid crystal panel 231 is a display unit for displaying an image. When the data constituting the display screen is supplied from the CPU 20, the liquid crystal driver 230 drives the liquid crystal panel 231 so as to display a desired display screen in the display area of the liquid crystal panel 231.

  The LAN module 240 is a module for communicating with the first LAN 3 by wireless or wired communication. The LAN module 240 is, for example, one that performs wireless communication in conformity with the IEEE (The Institute of Electrical and Electronics Engineers) 802.11 standard. Alternatively, the LAN module 240 is a module that performs wired communication in accordance with a standard such as 1000BASE-T, 100BASE-TX, or 10BASE-T.

  The internal storage unit 27 includes an internal storage 270 and an internal storage interface (I / F) 271. The internal storage 270 is a non-volatile semiconductor memory such as a flash memory or a hard disk drive, for example, and various files such as application programs, document files, sound files, image files, and moving image files used in the first information device 1A. Is memorized.

  The internal storage interface 271 controls the entire internal storage 270 and performs data read or write control when a data read or write command is issued to the internal storage 270, and outputs the read data.

  The internal storage 270 may be a removable memory card that can be inserted and removed. In this case, the internal storage interface 271 further includes a memory card slot in which the memory card is inserted.

  The USB controller 280 transmits / receives data to / from a USB device connected via the USB connector 281 according to, for example, the USB 2.0 or USB 3.0 standard. The USB connector 281 is a so-called female USB connector (USB receptacle), and is configured such that a male USB connector (USB plug) of a USB cable (not shown) can be inserted.

  FIG. 3 is a diagram showing an internal configuration example of the second information device 1B in the file synchronization system 100 shown in FIG. 3 is the same as FIG. 2 except that the LAN module 240 is changed to the LAN module 240A, and therefore only the LAN module 240A will be described.

  The LAN module 240 </ b> A is a module for communicating with the second LAN 4 by radio or wire. The same LAN module 240A as the LAN module 240 can be used.

  FIG. 4 is a diagram showing an internal configuration example of the first NAS 2A in the file synchronization system 100 shown in FIG.

  The first NAS 2A includes a CPU 30, a ROM 31, a RAM 32, an HDD unit 33, a wired LAN module 34, a USB controller 350, and a USB connector 351.

  The CPU 30, ROM 31, RAM 32, HDD unit 33, wired LAN module 34, and USB controller 350 are connected by a common bus.

  The CPU 30 controls the operation of the entire first NAS 2A by being executed after a program such as firmware stored in the ROM 31 is expanded in the RAM 32.

  The ROM 31 stores a program such as the firmware described above. The RAM 32 operates as a work memory of the first NAS 2A, and temporarily stores various programs and data.

  The HDD unit 33 includes an HDD 330 and an HDD interface (I / F) 331. The HDD 330 includes a disk that is a storage medium, a rotating unit that rotates the disk, and a head unit that reads and writes data from and to the disk (all not shown).

  The HDD interface 331 controls the entire HDD 330 and performs data read or write control when a data read or write command is issued to the HDD 330 and outputs the read data.

  In addition to the application program, the HDD 330 stores various files such as an application program, a document file, a sound file, an image file, or a moving image file transmitted from the first information device 1A registered with the first NAS 2A. Is stored as appropriate. The HDD 330 constitutes a first storage unit or a second storage unit.

  In the HDD 330, a folder A, a folder B, and a folder C are formed as folders indicating areas where various files described above are stored.

  The wired LAN module 34 performs wired communication with the first router 5A in accordance with, for example, the IEEE 802.3 standard. Instead of the wired LAN module 34, for example, a module that performs wireless communication with the first router 5A in conformity with the IEEE 802.11 standard may be used.

  The USB controller 350 transmits / receives data to / from a USB device connected via the USB connector 351 in accordance with, for example, the USB 2.0 or USB 3.0 standard. The USB connector 351 is a so-called female USB connector (USB receptacle), and is configured such that a male USB connector (USB plug) of a USB cable can be inserted.

  FIG. 5 is a diagram showing an internal configuration example of the second NAS 2B in the file synchronization system 100 shown in FIG. FIG. 5 is the same as FIG. 4 except that the wired LAN module 34 is changed to the wired LAN module 34A. Therefore, only the wired LAN module 34A will be described.

  The wired LAN module 34A performs wired communication with the second router 5B in accordance with, for example, the IEEE 802.3 standard. Instead of the wired LAN module 34A, for example, a module that performs wireless communication with the second router 5B in accordance with the IEEE 802.11 standard may be used.

  The folder A formed in the HDD 330 of the first NAS 2A is a folder that can store and edit files from the first information device 1A.

  The folder B formed in the HDD 330 of the first NAS 2A is a folder in which access from the first information device 1A is restricted, and is a folder synchronized with the folder B of the HDD 330 of the second NAS 2B. is there.

  The folder C formed in the HDD 330 of the first NAS 2A can be stored and edited by the first information device 1A and is synchronized with the folder C of the HDD 330 of the second NAS 2B. It is.

  The folder A formed in the HDD 330 of the second NAS 2B is a folder in which access from the second information device 1B is restricted, and is a folder synchronized with the folder A of the HDD 330 of the first NAS 2A. is there.

  A folder B formed in the HDD 330 of the second NAS 2B is a folder capable of storing and editing a file from the second information device 1B.

  The folder C formed in the HDD 330 of the second NAS 2B can be stored and edited by the second information device 1B and is synchronized with the folder C of the HDD 330 of the first NAS 2A. It is.

  Here, the access restriction to a folder is a state in which access to the folder and the file stored in the folder itself is impossible, or the file can be viewed but the file cannot be edited. Or, a state where the addition of a new file is restricted. This access restriction can be arbitrarily set for each folder or each file by the administrator of the first NAS 2A and the second NAS 2B.

  FIG. 6 is a diagram showing an internal configuration example of the service providing apparatus 7 in the file synchronization system 100 shown in FIG.

  The service providing apparatus 7 includes a CPU 70, ROM 71, RAM 72, HDD unit 73, wired LAN module 74, USB controller 750, and USB connector 751.

  The CPU 70, ROM 71, RAM 72, HDD unit 73, wired LAN module 74, and USB controller 750 are connected by a common bus.

  The CPU 70 performs an operation control of the entire service providing apparatus 7 by being executed after a program such as firmware stored in the ROM 71 is expanded in the RAM 72. The ROM 71 stores a program such as the firmware described above. The RAM 72 operates as a work memory of the service providing apparatus 7 and temporarily stores various programs and data.

  The HDD unit 73 includes an HDD 730 and an HDD interface (I / F) 731. The HDD 730 includes a disk that is a storage medium, a rotating unit that rotates the disk, and a head unit that reads and writes data from and to the disk (all not shown).

  The HDD interface 731 controls the entire HDD 730 and performs data read or write control when a data read or write command is issued to the HDD 730, and outputs the read data.

  The HDD 730 appropriately stores an application program, a registration table storing user registration information by the administrator of the first NAS 2A and the second NAS 2B by the service providing apparatus 7, and the like.

  Further, in the NAS storage area of the HDD 730, the shared folder a, the shared folder b, the folder A, the folder B, and the folder C formed in the HDD 330 of each of the first NAS 2A and the second NAS 2B, A shared folder c is stored.

  When the storage request for the file in the folder A is made from the first NAS 2A, the CPU 70 stores the requested file in the shared folder a corresponding to the folder A.

  When the storage request for the file in the folder B is made from the second NAS 2B, the CPU 70 stores the requested file in the shared folder b corresponding to the folder B.

  When the storage request for the file in the folder C is made from the first NAS 2A or the second NAS 2B, the CPU 70 stores the requested file in the shared folder c corresponding to the folder C.

  The wired LAN module 74 performs wired communication with the Internet 6 in conformity with, for example, the IEEE 802.3 standard.

  The USB controller 750 transmits / receives data to / from a USB device connected via the USB connector 751 in accordance with, for example, the USB 2.0 or USB 3.0 standard. The USB connector 751 is a so-called female USB connector (USB receptacle), and is configured such that a male USB connector (USB plug) of a USB cable can be inserted.

  When the service providing device 7 communicates with other devices on the Internet 6 including the first NAS 2A and the second NAS 2B, the HTTP (Hypertext Transfer Protocol) which is a protocol used for communication on the Internet 6 is used. Alternatively, HTTPS (Hypertext Transfer Protocol Secure) is used. The service providing device 7 communicates with a device having a firewall function, such as the first router 5A and the second router 5B, using a port provided for HTTP (for example, port number 80). I do.

  FIG. 7 is a functional block diagram of the CPU 30 of the first NAS 2A shown in FIG.

  The CPU 30 of the first NAS 2A includes a reception unit 30A, a file management unit 30B, an upload unit 30C, an update list acquisition unit 30D, a download unit 30E, and a synchronization processing unit 30F. These functional blocks are formed when the CPU 30 of the first NAS 2A executes a program including a file synchronization program stored in the ROM 31 of the first NAS 2A.

  The accepting unit 30A accepts a file storage request and a file read request input from the first information device 1A via the first LAN 3.

  The file management unit 30B controls the HDD interface 331 according to the file storage request received by the receiving unit 30A, and stores the storage target file in the HDD 330.

  In the upload unit 30C, a new file is stored in the folder A or the folder C of the HDD 330 by the file management unit 30B, the file name of the file in the folder A or the folder C of the HDD 330, or the content thereof, or both the file name and the content are stored. If the data stored in the folder A or the folder C of the HDD 330 is changed by the file management unit 30B or the like, the service providing device is selected from the files stored in the folder A or the folder C of the HDD 330. 7 to extract the synchronization target file to be uploaded.

  When a new file is stored in folder A or folder C of HDD 330, upload unit 30C extracts the new file as a synchronization target file.

  When the existing file stored in the folder A or the folder C of the HDD 330 is changed (overwritten and edited), the upload unit 30C overwrites the existing file, Extracts a difference file that indicates the changes to an existing file as a synchronization target file.

  The upload unit 30C generates a transmission file including the synchronization target file extracted in this manner and predetermined identification information. Then, the upload unit 30C transmits the transmission file to the service providing apparatus 7 from the wired LAN module 34 together with information indicating the storage folder of the synchronization target file included in the transmission file, and the service providing apparatus 7 Are stored in a shared folder corresponding to the storage folder in the NAS storage area.

  The identification information is information used to identify that the file including the identification information is a file stored in the first NAS 2A or the second NAS 2B constituting the file synchronization system 100. .

  As this identification information, for example, arbitrary information common to the file synchronization system 100 determined by the administrator of the first NAS 2A and the second NAS 2B is used. Alternatively, the identification information is information specific to the NAS that is the source of the transmission file (for example, the device model name, device ID (MAC (Media Access Control) address)), the name of the file synchronization program installed in the NAS, or The file synchronization program version information installed in the NAS is used. Hereinafter, the identification information will be described as a MAC address that is information unique to the NAS.

  The MAC address is a 48-bit code set in a device connectable to the network. The MAC address is usually expressed in hexadecimal octets, and is assigned a vendor ID, model ID, serial ID, or the like.

  In the ROM 31 of the first NAS 2A, the MAC address of the first NAS 2A and the MAC address of the second NAS 2B are stored in advance as identification information. The ROM 31 of the second NAS 2B stores in advance the MAC address of the second NAS 2B and the MAC address of the first NAS 2A as identification information.

  The upload unit 30C converts the synchronization target file into a predetermined file format, and generates a transmission file in which identification information is written in a predetermined area of the file after the file format conversion. The generated transmission file has the same file name as the synchronization target file and has a predetermined file format extension.

  The predetermined file format may be any file format as long as it has a predetermined area in which arbitrary information can be written. In the present embodiment, the ZIP format, which is one of the compression formats, is employed as the predetermined file format. The ZIP format is a file format in which a plurality of files are converted so as to be handled as one file (archive), a plurality of files are compressed together, or a single file is compressed. As the compression format, any format such as RAR, 7Z, LZH, or LHA can be applied in addition to the ZIP format. Note that the compression rate in the compression format is arbitrary, including the case where the compression rate is 0%.

  The ZIP file is provided with a comment area where an arbitrary comment can be written in the header portion. A transmission file can be generated by writing identification information in the comment area.

  When converting the synchronization target file into a ZIP file, the upload unit 30C sets a password necessary for using the ZIP file (decompressing the compressed file), and then generates a ZIP format transmission file. This password is commonly set for the file synchronization system 100 and is stored in advance in the ROMs 31 of the first NAS 2A and the second NAS 2B.

  The update list acquisition unit 30D requests the service providing apparatus 7 to transmit the file update list in units of folders of the HDD 330 at a timing determined in advance by the administrator, and transmits from the service providing apparatus 7 in response to this request. Get the list of updates that have been made.

  The file update list is a file update list previously stored by the update list acquisition unit 30D among files stored in an arbitrary shared folder in the NAS storage area of the service providing device 7 at the time when the request is made by the update list acquisition unit 30D. A list of files that have changed since the request was made.

  This update list includes the file name and metadata of each file. The metadata includes information for uniquely specifying the file and the state of the file, such as a title, creation date / time, update date / time, creator, file format (extension), and comment.

  The update list acquisition unit 30D acquires a list of all the files stored in the folder for each folder of the HDD 330 with respect to the service providing apparatus 7, and acquires the latest list acquired, the list acquired in the past, And an update list may be obtained by creating a list of files updated from the past as an update list.

  Here, the file list transmitted from the service providing apparatus 7 includes a file name and metadata as in the update list. By referring to the information for uniquely identifying the file and file status included in this metadata, for example, it can be determined that the file has been updated due to a difference in update date and time, or the file can be changed due to a difference in file name Alternatively, it is possible to determine the update status such as determining that it has been added.

  The download unit 30E selects a file whose extension matches the extension of the predetermined file format from among the files in the update list acquired by the update list acquisition unit 30D, and selects the selected file as a wired LAN module. It is acquired from the service providing apparatus 7 via 34.

  When the file acquired by the download unit 30E is a transmission file, the synchronization processing unit 30F performs processing for storing the synchronization target file included in the transmission file in the HDD 330 of the own device.

  Specifically, this process is a process of decompressing the transmission file using the password stored in the ROM 31 and storing the synchronization target file obtained by the decompression in the folder as the request target of the update list. It is. The synchronization processing unit 30F constitutes a storage control unit.

  If the file acquired by the download unit 30E is not a transmission file, the synchronization processing unit 30F deletes the file without decompression and storage in the folder.

  FIG. 8 is a functional block diagram of the CPU 30 of the second NAS 2B shown in FIG.

  The CPU 30 of the second NAS 2B includes a reception unit 30a, a file management unit 30b, an upload unit 30c, an update list acquisition unit 30d, a download unit 30e, and a synchronization processing unit 30f. These functional blocks are formed when the CPU 30 of the second NAS 2B executes a program including a file synchronization program stored in the ROM 31 of the second NAS 2B.

  The accepting unit 30a accepts a file storage request and a file read request input from the second information device 1B via the second LAN 4.

  The file management unit 30b controls the HDD interface 331 according to the file storage request received by the receiving unit 30a, and stores the storage target file in the HDD 330.

  In the upload unit 30c, a new file is stored in the folder B or the folder C of the HDD 330 by the file management unit 30b, or the file name of the file in the folder B or the folder C of the HDD 330 or the content thereof, or both the file name and the content are stored. If there is a change in the file stored in the folder B or folder C of the HDD 330 due to a change by the file management unit 30b, the service providing device 7 is selected from the files stored in the folder B or folder C of the HDD 330. Extract files to be synchronized to be uploaded.

  When a new file is stored in the folder B or folder C of the HDD 330, the upload unit 30c extracts the new file as a synchronization target file.

  When the existing file stored in the folder B or folder C of the HDD 330 is changed (overwritten or edited), the upload unit 30c overwrites the existing file, or A difference file indicating the contents of change to the existing file is extracted as a synchronization target file of the service providing apparatus 7.

  The upload unit 30c generates a transmission file including the synchronization target file extracted in this manner and predetermined identification information. Then, the upload unit 30c transmits the transmission file together with information indicating the storage folder of the synchronization target file included in the transmission file from the wired LAN module 34A to the service providing apparatus 7, and the transmission file is stored in the NAS storage area. The data is stored in a shared folder corresponding to the storage folder.

  The identification information is the same as that described above, and will be described below using the MAC address of the second NAS 2B as an example.

  The upload unit 30c converts the synchronization target file into the above-described predetermined file format (hereinafter referred to as ZIP format), and generates a transmission file in which identification information is written in a predetermined area of the file after the file format conversion. .

  The upload unit 30c, when converting the synchronization target file into a ZIP file, sets a password necessary for using the ZIP file (decompressing the compressed file) and generates a ZIP format transmission file. This password is the same as that described above, and is stored in advance in the ROM 31 of the second NAS 2B.

  The update list acquisition unit 30d requests the service providing apparatus 7 to transmit a file update list for each folder of the HDD 330 at a timing determined in advance by the administrator, and transmits from the service providing apparatus 7 in response to this request. Get the list of updates that have been made.

  The file update list is a file update list stored in an arbitrary shared folder in the NAS storage area of the service providing device 7 at the time when a request is made by the update list acquisition unit 30d. A list of files that have changed since the request was made.

  As described above, the update list includes the file name and metadata of each file.

  The download unit 30e selects a file whose extension matches the extension of the predetermined file format from among the files in the update list acquired by the update list acquisition unit 30d, and selects the selected file as a wired LAN module. It is acquired from the service providing apparatus 7 via 34A.

  When the file acquired by the download unit 30e is a transmission file, the synchronization processing unit 30f performs processing for storing the synchronization target file included in the transmission file in the HDD 330 of the own device.

  Specifically, this process uses the password stored in the ROM 31 to decompress the transmission file, and stores the synchronization target file obtained by the decompression in the folder that is the target of the update list. It is processing. The synchronization processing unit 30f constitutes a storage control unit.

  9 and 10 are flowcharts for explaining the operation of the file synchronization system 100 shown in FIG.

  9 and 10, the same file as the file stored in the folder C of the first NAS 2A is stored in the folder C of the second NAS 2B, so that the folder C and the second NAS 2B of the first NAS 2A are stored. The operation in the case of synchronization with the folder C will be described.

  On the liquid crystal panel 231 of the first information device 1A, a screen showing the data hierarchy in the HDD 330 of the first NAS 2A is displayed. With this screen displayed, the operation interface 260 of the first information device 1A is operated, and any file stored in the internal storage 270 of the first information device 1A is moved or copied to the folder C. Then, this arbitrary file is transmitted to the first NAS 2A (step S1).

  The file management unit 30B of the first NAS 2A stores an arbitrary file transmitted from the first information device 1A via the first LAN 3 in the folder C of the HDD 330 (step S2).

  Next, the upload unit 30C of the first NAS 2A determines whether or not any file stored in the HDD 330 in step S2 satisfies the file synchronization condition (step S3).

  The conditions for file synchronization are that the file extension is specified in advance, the file size (capacity) is less than or equal to the specified value, file date and time information (file creation date and time, file Update date / time or file last access date / time) is in a pre-designated range.

  If the arbitrary file stored in the HDD 330 in step S2 does not satisfy the file synchronization condition (step S3: NO), the upload unit 30C of the first NAS 2A shifts to a standby state without generating a transmission file. To do.

  For example, in the web service provided by the service providing device 7, the service providing device 7 may not accept storage of a large capacity file. Therefore, if the file extension is a video extension that can be determined to be a large file, or if the file size is large, exclude this file from the files to be synchronized. It is possible to flexibly handle cases where restrictions are imposed on services.

  When the arbitrary file stored in the HDD 330 in step S2 satisfies the file synchronization condition (step S3: YES), the upload unit 30C of the first NAS 2A sets the arbitrary file in the ZIP format with the password set. Conversion into a file (step S4).

  Further, the upload unit 30C of the first NAS 2A writes the MAC address of the first NAS 2A stored in the ROM 31 as identification information in the comment area of the ZIP file obtained in step S4 (step S5).

  Then, the upload unit 30C of the first NAS 2A, the ZIP file in which the MAC address is written in the comment area, the folder information indicating the storage folder (folder C) of the synchronization target file included in the ZIP file, and the ZIP file Is sent to the service providing device 7 (step S6).

  The CPU 70 of the service providing apparatus 7 stores the ZIP file transmitted from the first NAS 2A in the folder c of the NAS storage area according to the storage request signal and folder information transmitted from the first NAS 2A ( Step S7).

  The update list acquisition unit 30d of the second NAS 2B sends a request for an update list for the file stored in the folder c corresponding to the folder C of the HDD 330 of the own device to the service providing apparatus 7 at a predetermined timing. (Step S10).

  In response to this request, the service providing apparatus 7 creates an update list for the files stored in the folder c corresponding to the folder C (step S11), and uses the created update list as the requesting second NAS 2B. (Step S12).

  When the update list of the folder C transmitted from the service providing apparatus 7 is acquired by the update list acquisition unit 30d of the second NAS 2B, the download unit 30e of the second NAS 2B is acquired by the update list acquisition unit 30d. Whether there is a ZIP file in the update list of folder C is determined by the extension of each file described in the update list (step S13).

  When there is no ZIP file in the update list (step S13: NO), the download unit 30e of the second NAS 2B shifts to a standby state.

  When there is a ZIP file in the update list (step S13: YES), the download unit 30e of the second NAS 2B downloads the ZIP file described in the update list from the service providing device 7 and temporarily stores it in the RAM 32. (Step S14). The download unit 30e of the second NAS 2B may provide a temporary storage area in the HDD or the like instead of the RAM 32, and store the downloaded ZIP file in this temporary storage area.

  Next, the synchronization processing unit 30f of the second NAS 2B sequentially assigns serial numbers from “1” to “K” (K is an integer of 1 or more) to the ZIP file temporarily stored in the RAM 32. First, serial number N = 1 is set (step S15).

  Then, the synchronization processing unit 30f of the second NAS 2B determines whether or not the identification information (the MAC address of the first NAS 2A) is described in the comment area of the ZIP file with the serial number N (step S16).

  If the MAC address of the first NAS 2A is not described in the comment area of the serial number N ZIP file (step S16: NO), the synchronization processing unit 30f of the second NAS 2B discards the ZIP file of the serial number N. (Step S20).

  If the MAC address of the first NAS 2A is described in the comment area of the serial number N ZIP file (step S16: YES), the synchronization processing unit 30f of the second NAS 2B sets the password for this ZIP file. It is determined whether it is a thing (step S17).

  If this ZIP file is not set with a password (step S17: NO), the synchronization processing unit 30f of the second NAS 2B performs the process of step S20.

  If this ZIP file has a password set (step S17: YES), the synchronization processing unit 30f of the second NAS 2B decompresses this ZIP file using the password stored in the ROM 31. Process.

  If the synchronization processing unit 30f of the second NAS 2B succeeds in the decompression process and a synchronization target file is obtained (step S18: YES), the synchronization target file is stored in the HDD 330 folder of the second NAS 2B. C is stored (step S19).

  The synchronization processing unit 30f of the second NAS 2B performs the process of step S20 when the expansion process fails (step S18: NO).

  After the processing of step S19 and step S20, the synchronization processing unit 30f of the second NAS 2B determines whether or not the serial number N is “K” (step S21), and when the serial number N is not “K” (step S21). In step S21: NO), the serial number N is incremented by 1 (step S22), and the process returns to step S16.

  When the serial number N is “K” (step S21: YES), the synchronization processing unit 30f of the second NAS 2B shifts to a standby state.

  The same file as the file stored in the folder C of the second NAS 2B is stored in the folder C of the first NAS 2A, so that the folder C of the second NAS 2B and the folder C of the first NAS 2A are synchronized. In FIG. 9, the operation of the first information device 1A is performed by the second information device 1B, the operation of the first NAS 2A is performed by the second NAS 2B, and the operation of the second NAS 2B is performed in FIG. The only difference is that the operation is performed by the first NAS 2A, which is performed in the same manner as described with reference to FIGS.

  Next, the same file as the file stored in the folder B of the second NAS 2B is stored in the folder B of the first NAS 2A, so that the folder B of the second NAS 2B and the folder B of the first NAS 2A The operation when synchronization is performed will be described.

  FIG. 11 and FIG. 12 are flowcharts for explaining the operation in the case where the synchronization between the folder B of the second NAS 2B and the folder B of the first NAS 2A is performed in the file synchronization system 100 shown in FIG.

  When the operation interface 260 of the second information device 1B is operated and an arbitrary file stored in the internal storage 270 is moved to the folder B, the arbitrary file is transmitted to the second NAS 2B (step). S1A).

  The file management unit 30b of the second NAS 2B stores an arbitrary file transmitted from the second information device 1B via the second LAN 4 in the folder B of the HDD 330 (step S2A).

  Next, the upload unit 30c of the second NAS 2B determines whether or not any file stored in the HDD 330 in step S2A satisfies the file synchronization condition (step S3A). This condition is as described above.

  When the arbitrary file stored in the HDD 330 in step S2A does not satisfy the file synchronization condition (step S3A: NO), the upload unit 30c of the second NAS 2B does not generate a transmission file and shifts to a standby state. To do.

  When the arbitrary file stored in the HDD 330 in step S2A satisfies the file synchronization condition (step S3A: YES), the upload unit 30c of the second NAS 2B sets the arbitrary file in the ZIP format with the password set. Conversion into a file (step S4A).

  Further, the upload unit 30c of the second NAS 2B writes the MAC address of the second NAS 2B stored in the ROM 31 as identification information in the comment area of the ZIP file obtained in step S4A (step S5A).

  Then, the upload unit 30c of the second NAS 2B, the ZIP file in which the MAC address is written in the comment area, the folder information indicating the storage folder (folder B) of the synchronization target file included in the ZIP file, and the ZIP file Is sent to the service providing apparatus 7 (step S6A).

  The CPU 70 of the service providing device 7 stores the ZIP file transmitted from the second NAS 2B in the folder b of the NAS storage area according to the storage request signal and folder information transmitted from the second NAS 2B ( Step S7A).

  The update list acquisition unit 30D of the first NAS 2A requests the service providing apparatus 7 for an update list for the folder B of the HDD 330 of the own apparatus at a predetermined timing (step S10A).

  In response to this request, the service providing device 7 creates an update list for the files stored in the folder b corresponding to the folder B (step S11A), and uses the created update list as the requesting first NAS 2A. (Step S12A).

  When the update list of the folder B transmitted from the service providing apparatus 7 is acquired by the update list acquisition unit 30D of the first NAS 2A, the download unit 30E of the first NAS 2A is acquired by the update list acquisition unit 30D. Whether there is a ZIP file in the update list of folder B is determined based on the extension of the file described in the update list (step S13A).

  If there is no ZIP file in the update list (step S13A: NO), the download unit 30E of the first NAS 2A shifts to a standby state.

  When there is a ZIP file in the update list (step S13A: YES), the download unit 30E of the first NAS 2A downloads the ZIP file described in the update list from the service providing device 7 and stores it in the RAM 32. Temporary storage is performed (step S14A).

  Next, the synchronization processing unit 30F of the first NAS 2A sequentially assigns serial numbers from “1” to “K” (K is an integer of 1 or more) to the ZIP file temporarily stored in the RAM 32. First, serial number N = 1 is set (step S15A).

  Then, the synchronization processing unit 30F of the first NAS 2A determines whether or not the identification information (the MAC address of the second NAS 2B) is described in the comment area of the ZIP file with the serial number N (step S16A).

  When the MAC address of the second NAS 2B is not described in the comment area of the serial number N ZIP file (step S16A: NO), the synchronization processing unit 30F of the first NAS 2A discards the ZIP file of the serial number N. (Step S20A).

  When the MAC address of the second NAS 2B is described in the comment area of the serial number N ZIP file (step S16A: YES), the synchronization processing unit 30F of the first NAS 2A sets the password for this ZIP file. It is determined whether it is a thing (step S17A).

  If this ZIP file has no password set (step S17A: NO), the synchronization processing unit 30F of the first NAS 2A performs the process of step S20A.

  If this ZIP file has a password set (step S17A: YES), the synchronization processing unit 30F of the first NAS 2A decompresses this ZIP file using the password stored in the ROM 31. Process.

  Then, when the synchronization processing unit 30F of the first NAS 2A succeeds in the decompression processing and obtains the synchronization target file (step S18A: YES), the synchronization processing unit 30F stores the synchronization target file in the folder B of the HDD 330 ( Step S19A).

  When the decompression process fails (step S18A: NO), the synchronization processing unit 30F of the first NAS 2A performs the process of step S20A.

  After the processing of step S19A and step S20A, the synchronization processing unit 30F of the first NAS 2A determines whether or not the serial number N is “K” (step S21A), and when the serial number N is not “K” (step S21A). In step S21A: NO), the serial number N is incremented by 1 (step S22A), and the process returns to step S16A.

  When the serial number N is “K” (step S21A: YES), the synchronization processing unit 30F of the first NAS 2A shifts to a standby state.

  The same file as the file stored in the folder A of the first NAS 2A is stored in the folder A of the second NAS 2B, so that the folder A of the first NAS 2A and the folder A of the second NAS 2B are synchronized. In FIG. 11, the operation of the second information device 1B is performed by the first information device 1A, the operation of the second NAS 2B is performed by the first NAS 2A, and the operation of the first NAS 2A in FIG. The second NAS 2B performs the operation, and the folder B and the folder b are replaced with the folder A and the folder a, respectively.

  As described above, according to the file synchronization system 100, only the synchronization target file included in the transmission file including the identification information is downloaded from the service providing apparatus 7 to each of the first NAS 2A and the second NAS 2B. become.

  For this reason, even if an unknown source file that does not include identification information is stored in the NAS storage area of the service providing apparatus 7, this file is stored in the first NAS 2A and the second NAS 2B. There is no. Therefore, file synchronization between the first NAS 2A and the second NAS 2B can be performed safely.

  Further, according to the file synchronization system 100, it is determined whether or not the file to be subjected to file synchronization is determined based on the identification information added to the transmission file. Downloaded from the device 7 by the first NAS 2A or the second NAS 2B.

  Therefore, the first NAS 2A, which is the transmission source of the transmission file including the synchronization target file, can download the synchronization target file to the second NAS 2B even if the IP address of the second NAS 2B is unknown. .

  Thus, since file synchronization can be performed without performing direct communication between the first NAS 2A and the second NAS 2B, even when the IP address of the first NAS 2A or the second NAS 2B is changed, As long as the first NAS 2A or the second NAS 2B can connect to the Internet 6 or the service providing device 7, file synchronization is possible. By enabling file synchronization without performing direct communication between the first NAS 2A and the second NAS 2B, a DDNS server is not required as described in Patent Document 1. For this reason, the construction cost of the file synchronization system 100 can be reduced.

  Further, in the file synchronization system 100, the synchronization target file is converted into a predetermined file format, and identification information is written in a predetermined area (an area in which arbitrary information can be written) of the file after the file format conversion. A transmission file including the target file and identification information is generated.

  Therefore, regardless of the extension of the synchronization target file, the transmission file can be generated in a common format in the system. As a result, it is possible to easily construct a system in which the types of files stored in the first NAS 2A and the second NAS 2B are not limited.

  In particular, by adopting the ZIP format that is widely spread as a predetermined file format, the above-described effects can be obtained without installing special application software in the first NAS 2A and the second NAS 2B.

  In the file synchronization system 100, the transmission file is stored in the service providing apparatus 7 with a password set in the transmission file. In the first NAS 2A and the second NAS 2B that downloaded the transmission file, the decompression process is performed using the password only for the transmission file in which the password is set, and the synchronization is performed only when the decompression process is successful. The target file is stored in the HDD 330.

  With such a configuration, even if a password-free ZIP file including identification information is temporarily stored in the NAS storage area of the service providing apparatus 7, the ZIP file is not decompressed. Therefore, it is possible to increase the safety by reducing the possibility that the file whose source is unknown is stored in the first NAS 2A and the second NAS 2B.

  Further, even when the transmission file stored in the NAS storage area of the service providing apparatus 7 is leaked, it is possible to prevent the synchronization target file included in the transmission file from being used.

  The upload unit 30C and the upload unit 30c may generate a transmission file including a synchronization target file and secondary identification information generated from the identification information. The secondary identification information is information generated based on the metadata and identification information of the synchronization target file. The secondary identification information is generated by a predetermined rule by combining the file name of the synchronization target file and the identification information, for example.

  In this case, in step S16 of FIG. 10, the synchronization processing unit 30f determines that there is secondary identification information in the comment area of the ZIP file, and then analyzes the secondary identification information to identify the identification information from the secondary identification information. Only when it can be read out, the processing after step S17 is performed. Alternatively, the synchronization processing unit 30f can read the identification information from the secondary identification information, and the metadata read from the secondary identification information is the same as the metadata of the file stored in the ZIP file. Only when it can be confirmed, the processing after step S17 is performed.

  According to this configuration, since the secondary identification information is unique information generated by a combination of the synchronization target file and the identification information, the secondary identification information is leaked and this secondary identification information is described in the comment area. Even when a ZIP file whose publisher is unknown is stored in the NAS storage area of the service providing apparatus 7, it is possible to prevent the ZIP file from being decompressed.

  In the file synchronization system 100, the upload unit 30C and the upload unit 30c set a password for the transmission file, but setting the password is not essential.

  In the file synchronization system 100, in the first NAS 2A and the second NAS 2B, this file is converted into a ZIP file only when the file transmitted from the information device satisfies the file synchronization condition, and the service providing apparatus 7 It is stored in the NAS storage area.

  For this reason, flexible operation according to the intention of the administrator of the first NAS 2A and the second NAS 2B is possible. In this way, by limiting the files stored in the service providing device 7, the contract size of the NAS storage area of the service providing device 7 can be reduced, and the cost of using the web service can be reduced. In addition, the storage capacities of the first NAS 2A and the second NAS 2B can be reduced.

  In the file synchronization system 100, the upload unit 30C and the upload unit 30c may not limit the files that can be uploaded to the service providing apparatus 7.

  In FIG. 9, the case where one file is transmitted to the first NAS 2A in step S1 has been described. However, in this step S1, the entire folder including a plurality of files may be transmitted to the first NAS 2A.

  In this case, the upload unit 30C of the first NAS 2A determines whether or not the file synchronization condition is satisfied for each of the plurality of files included in this folder. Then, the upload unit 30C of the first NAS 2A may delete the file that does not satisfy the condition from the above folder, and convert the deleted folder into a ZIP file in step S4.

  Further, in the file synchronization system 100, the upload unit 30C or the upload unit 30c extracts an overwrite file for an existing file stored in the HDD 330 as a synchronization target file, and a ZIP obtained by converting the overwrite file into a ZIP format. When storing the file in the NAS storage area, an instruction is given to replace the ZIP file having the same name as the existing file stored in the NAS storage area with the ZIP file obtained by the conversion. Just put it out.

  Further, in the file synchronization system 100, the upload unit 30C or the upload unit 30c extracts a difference file indicating the change contents with respect to the existing file stored in the HDD 330 as a synchronization target file, and converts the difference file into a ZIP format. When storing the obtained ZIP file in the NAS storage area, the ZIP file obtained by the above conversion is associated with the ZIP file having the same name as the existing file stored in the NAS storage area. An instruction may be issued to memorize.

  Then, the synchronization processing unit 30F or the synchronization processing unit 30f downloads the ZIP file obtained by converting the differential file into the ZIP format, and when the decompression process is successful, the differential file obtained by the decompression process. And the existing file associated with the ZIP file may be combined to update the file.

  10 and 12, the download unit 30E and the download unit 30e select only the ZIP file in the update list and download the selected ZIP file. However, the download unit 30E and the download unit 30e download all the files in the update list, and the downloaded files are ZIP files, identification information is added, and passwords are set. Only the file may be configured to perform the decompression process.

  Alternatively, the download unit 30E and the download unit 30e may be configured to download only the transmission file to which the identification information is added from among the files in the update list and temporarily store them in the RAM 32. In this configuration, it is assumed that the information described in the comment area of the transmission file is included in the metadata of the transmission file included in the update list. The operation in this case will be described with reference to FIG.

  FIG. 13 is a flowchart for explaining a modification of the operation of the file synchronization system 100 shown in FIG. The flowchart shown in FIG. 13 is obtained by deleting step S13 and step S16 in FIG. 10 and changing step S14 to step S14B. Hereinafter, description will be made centering on the changes to FIG.

  When the update list is acquired in step S12, the download unit 30e of the second NAS 2B checks the metadata extension and comment area information of all the files in the update list, Thus, only the ZIP file whose identification information is described in the comment area is downloaded from the service providing apparatus 7 and temporarily stored in the RAM 32 (step S14B).

  After step S14B, the synchronization processing unit 30f assigns a serial number N to the ZIP file temporarily stored in the RAM 32, sets the serial number N to “1” (step S15), and a password is stored in the ZIP file of serial number N. It is determined whether it is set (step S17). After this, the process after step S18 is performed.

  According to the operation example shown in FIG. 13, the number of files downloaded to the second NAS 2B can be minimized. For this reason, the time required for file synchronization can be shortened, and the processing load of the second NAS 2B can be reduced.

  The file synchronization program stored in the ROM 31 of each of the first NAS 2A and the second NAS 2B is stored in a non-transitory storage medium from which the computer can read the program. Such a “computer-readable storage medium” includes, for example, an optical medium such as a CD-ROM (Compact Disc-ROM), a magnetic storage medium such as a USB memory or a memory card, and the like. Such a program can also be provided by downloading via the Internet 6.

  As described above, the following items are disclosed in this specification.

  The disclosed file synchronization system includes a first terminal device having a first storage unit in which a synchronization target file is stored, a second terminal device having a second storage unit, and a first network. A service providing device configured to be communicable with the first terminal device and the second terminal device, and including a storage area allocated to the first terminal device and the second terminal device; The first terminal apparatus performs control for storing a transmission file including the synchronization target file and predetermined identification information in the storage area of the service providing apparatus. The second terminal device includes an upload unit for performing a file stored by the device other than its own device in the storage area of the service providing device from the service providing device. And a storage control unit that stores a synchronization target file included in the transmission file in the second storage unit when the file acquired by the download unit is the transmission file. It is.

  The disclosed terminal device is a terminal device having a first storage unit in which a synchronization target file is stored, and includes a transmission file including the synchronization target file and predetermined identification information, An upload unit configured to be communicable with a plurality of the terminal devices via a network and performing control to be stored in the storage area of a service providing apparatus including a storage area allocated to the plurality of terminal apparatuses; A download unit that acquires a file stored in the storage area of the service providing device by a device other than its own device from the service providing device, and when the file acquired by the download unit is the transmission file, the transmission file A synchronization processing unit that performs processing for storing the synchronization target file included in the first storage unit It is intended.

  In the disclosed terminal device, the upload unit converts the synchronization target file stored in the first storage unit into a predetermined file format, and stores the identification information in a predetermined area of the file after the file format conversion. The written data is stored in the storage area as the transmission file.

  In the disclosed terminal device, the upload unit performs file format conversion by compressing the synchronization target file stored in the first storage unit to generate a compressed file, and the generated compressed file The comment area is the predetermined area, and the identification information written in the comment area is stored in the storage area as the transmission file.

  In the disclosed terminal device, the upload unit sets a predetermined password necessary for using the file and then compresses the synchronization target file to generate the compressed file. The synchronization processing unit includes the download unit. When the file acquired in step (b) is the transmission file, a decompression process for decompressing the transmission file with the predetermined password is performed. When the decompression process is successful, the synchronization target file obtained by the decompression process is It is stored in one storage unit.

  In the disclosed terminal device, the upload unit stores the transmission file in the storage area only when at least one of the size, extension, and date / time information of the synchronization target file satisfies a predetermined condition. It is something to be made.

  The disclosed terminal device is configured to be able to communicate with a plurality of devices registered in advance via a second network different from the first network, and from each of the plurality of devices, the first storage unit Including those capable of storing files and editing files in the first storage unit.

  In the disclosed file synchronization method, a terminal device having a first storage unit in which a synchronization target file is stored includes a transmission file including the synchronization target file and predetermined identification information in a first network. And is configured to be communicable with a plurality of the terminal devices via the network, and to store in the storage area of the service providing apparatus including a storage area allocated to the plurality of terminal apparatuses. When a file stored in the storage area by a device other than its own device is acquired from the service providing device, and the acquired file is the transmission file, the synchronization target file included in the transmission file is the first file Processing for storing in the storage unit is performed.

  The disclosed file synchronization program stores a transmission file including the synchronization target file and predetermined identification information in a terminal device having a first storage unit in which the synchronization target file is stored. An upload step for performing control to store in the storage area of a service providing apparatus including a storage area allocated to the plurality of terminal apparatuses and configured to be communicable with the plurality of terminal apparatuses via the network; and A download step for acquiring a file stored in the storage area of the device other than its own device from the service providing device, and when the file acquired by the download step is the transmission file, the file is included in the transmission file Performs processing for storing the synchronization target file in the first storage unit A period processing step is for to run.

100 file synchronization system 1A first information device 1B second information device 2A first NAS
2B Second NAS
3 First LAN
4 Second LAN
5A First router 5B Second router 6 Internet 7 Service providing device 30 CPU
31 ROM
32 RAM
33 HDD unit 330 HDD
A, B, C Folder 30A, 30a Accepting unit 30B, 30b File management unit 30C, 30c Upload unit 30D, 30d Update list acquisition unit 30E, 30e Download unit 30F, 30f Synchronization processing unit

Claims (9)

A first terminal device having a first storage unit storing a synchronization target file; a second terminal device having a second storage unit; the first terminal device via a first network; and A file synchronization system configured to be communicable with a second terminal device and comprising a service providing device including a storage area allocated to the first terminal device and the second terminal device, ,
The first terminal device includes an upload unit that performs control to store a transmission file including the synchronization target file and predetermined identification information in the storage area of the service providing device,
The second terminal device includes: a download unit that acquires a file stored by a device other than the device itself in the storage area of the service providing device from the service providing device; and the file acquired by the download unit is the And a storage control unit that stores a synchronization target file included in the transmission file in the second storage unit when the file is a transmission file. A terminal device having a first storage unit in which a synchronization target file is stored,
A transmission file including the synchronization target file and predetermined identification information is configured to be communicable with a plurality of the terminal devices via a first network and assigned to the plurality of terminal devices. An upload unit for performing control to be stored in the storage area of the service providing apparatus having the storage area;
A download unit that acquires a file stored in the storage area of the service providing device by a device other than the device itself from the service providing device;
A synchronization processing unit that performs processing for storing a synchronization target file included in the transmission file in the first storage unit when the file acquired by the download unit is the transmission file; . The terminal device according to claim 2,
The upload unit converts the synchronization target file stored in the first storage unit into a predetermined file format, and writes the identification information in a predetermined area of the file after the file format conversion as the transmission file As a terminal device stored in the storage area. The terminal device according to claim 3,
The upload unit performs file format conversion by generating a compressed file by compressing the synchronization target file stored in the first storage unit, and uses the comment area of the generated compressed file as the predetermined area A terminal device that stores the identification information written in the comment area in the storage area as the transmission file. The terminal device according to claim 4,
The upload unit generates a compressed file by compressing the synchronization target file after setting a predetermined password necessary for using the file,
When the file acquired by the download unit is the transmission file, the synchronization processing unit performs a decompression process for decompressing the transmission file with the predetermined password, and when the decompression process is successful, A terminal device that stores the obtained synchronization target file in the first storage unit. The terminal device according to any one of claims 2 to 5,
The upload unit is a terminal device that stores the transmission file in the storage area only when at least one of the size, extension, and date / time information of the synchronization target file satisfies a predetermined condition. The terminal device according to any one of claims 2 to 6,
It is configured to be able to communicate with a plurality of devices registered in advance via a second network different from the first network, and from each of the plurality of devices, storing a file to the first storage unit and A terminal device capable of editing a file in the first storage unit. A terminal device having a first storage unit in which a synchronization target file is stored,
A transmission file including the synchronization target file and predetermined identification information is configured to be communicable with a plurality of the terminal devices via a first network and assigned to the plurality of terminal devices. Control to store in the storage area of the service providing device including the storage area,
A file stored by the device other than the device itself in the storage area of the service providing device is acquired from the service providing device,
A file synchronization method for performing processing for storing a synchronization target file included in the transmission file in the first storage unit when the acquired file is the transmission file. In the terminal device having the first storage unit in which the synchronization target file is stored,
A transmission file including the synchronization target file and predetermined identification information is configured to be communicable with a plurality of the terminal devices via a first network and allocated to the plurality of terminal devices. An uploading step for performing control to store in the storage area of the service providing apparatus including the area;
A download step of acquiring from the service providing device a file stored by a device other than the device itself in the storage area of the service providing device;
A synchronization processing step for performing processing for storing a synchronization target file included in the transmission file in the first storage unit when the file acquired by the download step is the transmission file; File sync program.

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