JP2006209336A - File format conversion server, mobile terminal device, and file format conversion system - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a file format conversion system capable of causing mobile terminal devices to receive electronic files of file formats that can be displayed or edited by the devices. <P>SOLUTION: The file format conversion server for converting electronic data of certain file formats into electronic files of other file formats includes a format selecting process part for storing correspondence between the file formats that can be processed by a variety of mobile terminal devices, and a communication control part for receiving the electronic files and information about the kind of each mobile terminal device 1 from the mobile terminal devices each of which is capable of processing data in the electronic files of at least one file format. By referring to the correspondence stored in the format selecting process part, the server converts the electronic files received by the selection of the file format that matches the kind of each mobile terminal device into electronic files of the file format selected by the format selecting process part. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a file format conversion server, a mobile terminal device, and a file format conversion system that automatically convert various file formats of an electronic file into a predetermined file format that can be displayed or edited by a mobile terminal device.

  In general, a personal computer can cope with files of various file formats by adding software capable of displaying or editing an electronic file of a predetermined file format. On the other hand, a portable terminal device such as a mobile phone is reduced in size by placing importance on portability and the like, so that the storage capacity of the storage device included in the portable terminal device is limited, such as a personal computer. It is difficult to add a plurality of the above software. For this reason, the mobile terminal device can only display or edit electronic files of a limited type of file format.

  Today, a portable terminal device has registered in advance a file format that can be displayed or edited by the portable terminal device when the portable terminal device has an electronic file in a file format that cannot be displayed or edited. By using the file format conversion server, the electronic file is transmitted to the file format conversion server, and the electronic file converted into the file format registered in advance is received from the file format conversion server. An automatic file format conversion system that can display or edit electronic files has been proposed (see, for example, Patent Document 1).

JP 2004-78354 A

  However, since the file format conversion server in the conventional automatic file format conversion system converts an electronic file into a file format designated in advance by the user of the mobile terminal device, the conventional system uses a file to the server. The format registration process had to be performed in advance, and it was time-consuming for the mobile terminal device user.

  A file format conversion server in a conventional automatic file format conversion system converts an electronic file into a predetermined file format registered in advance, and converts the electronic file once converted into a file format before conversion. Returning is not considered. As a usage of the mobile terminal device, it is conceivable that after editing the electronic file received from the file format conversion server, it should be saved or transmitted after returning to the format before the conversion by the file format conversion server. It was not possible to cope with such a case.

  The present invention has been made in view of the above circumstances, and an electronic file having a file format that can be displayed or edited by a mobile terminal device without performing file format registration processing in the file format conversion server. It is an object of the present invention to provide a file format conversion server, a portable terminal device, and a file format conversion system that can be received by a device.

  The present invention also provides a file format conversion server, a portable terminal device that can edit an electronic file received from a file format conversion server and then return the edited electronic file to a format before conversion by the file format conversion server. It is an object to provide a terminal device and a file format conversion system.

  The file format conversion server of the present invention is a file format conversion server that converts electronic data of an arbitrary file format into an electronic file of another file format, and can process data by various portable terminal devices and various portable terminal devices. A first storage means for storing a correspondence relationship between the file format, a portable terminal device capable of data processing of an electronic file of at least one file format, an electronic file, and information on a terminal type of the portable terminal device; The first receiving means for receiving, the selecting means for selecting the file format corresponding to the terminal type of the portable terminal device with reference to the correspondence stored in the first storing means, and the first receiving means received by the first receiving means The electronic file is stored in the file format selected by the selecting means. Conversion means for converting the mat of the electronic file, the electronic file obtained by converting the file format by the conversion means, a first transmission means for transmitting to said portable terminal device, in which comprises a.

  The portable terminal device of the present invention is a portable terminal device capable of data processing of an electronic file of at least one file format, and converts the electronic data of an arbitrary file format into an electronic file of another file format In addition, the second transmission means for transmitting the electronic file and information regarding the terminal type of the mobile terminal device, and the electronic file whose file format has been converted by the file format conversion server from the file format conversion server. A second receiving means.

  Further, in the mobile terminal device of the present invention, the second transmission means sends, to the file format conversion server, an electronic file having a file format that cannot be processed by the mobile terminal device, and information on a terminal type of the mobile terminal device; , Including what to send.

  The file format conversion system of the present invention includes the file format conversion server of the present invention and the mobile terminal device of the present invention.

  With this configuration, the file format conversion server automatically selects the optimum file format that can be displayed or edited on the mobile terminal device by simply inputting a display or editing instruction on the mobile terminal device. Reply to the terminal device. As a result, when an instruction to display or edit a file is input to the mobile terminal device, the file is automatically converted into a file of an appropriate file format without any trouble of the user by specifying the file format. Thus, the user can quickly open and view it on the screen of the mobile terminal device.

  In the file format conversion server of the present invention, the conversion unit assigns conversion identification information to the electronic file for each conversion of the electronic file by the conversion unit, and the first transmission unit performs conversion identification by the conversion unit. Includes sending electronic files with assigned information.

  Further, the file format conversion server of the present invention provides a combination of the file format of the electronic file before conversion by the conversion means and the file format of the electronic file after conversion by the conversion means, and the electronic file converted by the conversion means. The second storage means for storing the correspondence between the conversion identification information assigned to the file and the conversion identification information stored in the second storage means, the electronic file received by the first reception means is converted into the conversion information. Detecting means for detecting that the electronic file has been converted by the means, and the converting means detects the electronic file received by the first receiving means when the detecting means detects the second electronic file. Refer to the combination stored in the storage means, and convert the electronic file to the file format before conversion. Including those that conversion.

  In the mobile terminal device of the present invention, the second receiving unit receives an electronic file to which conversion identification information is assigned from the file format conversion server, and the second transmitting unit is configured to receive the second receiving unit. Includes sending electronic files that have been processed after being received.

  With this configuration, even if the file format has been converted once, the file format conversion server records the file format before the file format conversion, so the original file format is restored when the user finishes displaying or editing. Can be returned automatically.

  In the file format conversion server of the present invention, the first transmission means transmits the electronic file whose file format has been converted by the conversion means and the file format information before the electronic file conversion by the conversion means. including.

  In the file format conversion server of the present invention, the first receiving unit receives an electronic file and file format information before the electronic file conversion, and the converting unit receives the first receiving unit. This includes converting an electronic file into a file format before conversion of the electronic file based on file format information before conversion of the electronic file.

  Further, in the portable terminal device of the present invention, the second receiving means includes an electronic file whose file format is converted by the file format conversion server from the file format conversion server, file format information before the electronic file conversion, , And the second transmission means transmits the electronic file that has been processed by the data received by the second reception means and the file format information before the electronic file conversion.

  With this configuration, even if the file format has been converted once, the mobile terminal device records the file format before the file format conversion, so it automatically returns to the original file format when the user finishes displaying or editing. Can be restored.

  According to the file format conversion server, the mobile terminal device, and the file format conversion system of the present invention, the file format that can be displayed or edited by the mobile terminal device without performing the file format registration process in the file format conversion server. The electronic file can be received by the portable terminal device.

  Further, according to the file format conversion server, the mobile terminal device, and the file format conversion system of the present invention, after the mobile terminal device edits the electronic file received from the file format conversion server, the edited electronic file is converted into the file format. Can return to the format before conversion by the conversion server

  A file format conversion system according to an embodiment of the present invention will be described below with reference to the drawings.

(First embodiment)
FIG. 1 is a block diagram showing a file format conversion system according to the first embodiment of this invention. In FIG. 1, the file format conversion system includes a mobile terminal device 1, a file format conversion server 2, and a network 3 that connects the mobile terminal device 1 and the file format conversion server 2.

  The mobile terminal device 1 is a mobile phone or a PDA (Personal Digital Assistant) and has a function of displaying or editing at least one file format. The PDA is assumed to be a type of terminal in which functions (viewer, editor, etc.) that it has cannot be freely added or changed.

  When the file format conversion server 2 receives an electronic file of a file format that cannot be displayed or edited by the mobile terminal device 1 from the mobile terminal device 1, the file format conversion server 2 automatically selects a file format that can be displayed or edited according to the terminal type of the mobile terminal device 1. It has a function of transmitting to the portable terminal device 1 an electronic file that has been detected and converted into the detected file format.

  The network 3 includes a network for a specific mobile phone service and a network such as a wireless LAN (Local Area Network).

  2 and 3 are conceptual diagrams of such a file format conversion system including the mobile terminal device 1, the file format conversion server 2, and the network 3. FIG. FIG. 2 describes a file format conversion system in a general mobile phone network. In FIG. 2, the mobile terminal device 1 which is a mobile phone and the base station 4 of the mobile phone are connected wirelessly, and the base station 4 and the file format conversion server 2 are located at the boundary between the mobile phone network 3 and the mobile phone network. It is connected to the gateway 5. Here, the file format conversion server 2 is generally arranged in a network outside the mobile phone network such as the Internet, and in order to connect to the mobile phone network 3, a special device such as a gateway 5 that connects different networks is used. I need it.

  FIG. 3 describes a file format conversion system in a general wireless LAN network. In FIG. 3, the mobile terminal device 1 and the wireless access point 6 are connected wirelessly, and the wireless access point 6 and the file format conversion server 2 are connected by wire via the wireless LAN network 3. Unlike the case of FIG. 2, the file format conversion system of FIG. 3 does not have a gateway between the mobile terminal device 1 and the file format conversion server 2.

  In FIG. 1, the mobile terminal device 1 includes a file viewer 11, a file editor 12, an input unit 13, a file operation unit 14, a file storage unit 15, a communication control unit 16, and a physical communication interface 17. .

  Among these, the file viewer 11 functions to display a file in a predetermined file format on a display unit (not shown). For example, an HTML (Hyper Text Markup Language) viewer (this is a function of a general Web browser). PDF (Portable Digital Assistant) viewer or the like is used.

  Further, the file editor 12 functions to edit a file having a predetermined file format, such as a text editor or an HTML editor.

  The input unit 13 is used by a user to select a file and input a display or editing instruction by key operation.

  The file operation unit 14 operates the file based on the selection and instruction of the file by the user. When the display or editing operation is impossible, the terminal type and the file are transmitted to the file format conversion server 3 so as to convert the file format.

  The file storage unit 15 is a recording device such as a flash memory or an SD card for storing files. The file storage unit 15 is a file attached to an e-mail transmitted from a personal computer, a file downloaded from the Web, or a file copied from a personal computer. Functions to store etc.

  The communication control unit 16 functions to control data communication based on a communication protocol (for example, TCP / IP). The physical communication interface 17 is a wireless communication device such as a wireless LAN, and includes an antenna, a communication module, a control driver (program), and the like.

  The network 3 is a communication network such as a wireless LAN as described above. The mobile terminal device 1 side is wireless access, and the file format conversion server 2 side is wired access.

  On the other hand, the file format conversion server 2 includes a format conversion control unit 21, a file analysis processing unit 22, a format selection processing unit 23, a file conversion processing unit 24, a conversion history recording unit 25, a communication control unit 26, And a physical communication interface 27.

  Among these, the format conversion control unit 21 receives a file from the portable terminal device 1 through the physical communication interface 27 and the communication control unit 26, and sequentially calls the following signal processing units to convert the file into an appropriate file format. , Function to transmit to the mobile terminal 1.

  The file analysis processing unit 22 functions to analyze the file transmitted from the mobile terminal device 1 and identify the file format of this file. As a method for identifying the file format, there are a method for identifying and analyzing the contents of the file, and a method for identifying from the file extension (for example, .doc, .xls, etc.). In the present embodiment, the file format is identified by the extension.

  The format selection processing unit 23 functions to select an appropriate file format according to the type of the mobile terminal device. In this embodiment, the format selection processing unit 23 stores a correspondence table between the mobile terminal device 1 and the file format as shown in Table 1, and selects an appropriate file format from this correspondence table.

  The file conversion processing unit 24 is composed of a set of programs called a converter that converts a file format, and includes, for example, a file converter of Software interface.

  The conversion history recording unit 25 functions as a recording unit and is a recording device such as an HDD for recording the conversion history, and records the conversion number and the original file format. The conversion number is a value unique within the conversion server.

  The communication control unit 26 controls data communication based on a predetermined communication protocol.

  The physical communication interface 27 is a wired communication device such as ATM (Asynchronous Transfer Mode) or Ethernet, and specifically corresponds to a physical device generally called NIC (Network Interface Card).

Next, the operation of the file format conversion system will be described.
FIG. 4 is an explanatory diagram conceptually showing the operation of the file format conversion system when a file is displayed by the mobile terminal device 1. FIG. 4 is an explanatory diagram of an operation when a user requests display of a Word format electronic file that cannot be displayed by the file viewer 11 of the mobile terminal device 1.

  In the present invention, when there is a document display request (instruction), the mobile terminal device 1 transmits the terminal type and file to the file format conversion server 2. The file format conversion server 2 identifies the type and file format of the mobile terminal device 1, automatically selects a PDF file format suitable for the mobile terminal device 1, converts the file to a file format, and performs the mobile terminal device 1. Send to.

  For this reason, on the screen of the mobile terminal device 1, the PDF electronic file that can be displayed by the file viewer 11 is automatically opened and displayed on the screen requested Word format electronic file.

  FIG. 5 is a flowchart showing the operation procedure of the file format conversion system in more detail when the file is displayed by the mobile terminal device 1. The operation will be described with reference to this flowchart.

  First, the user operates the input unit 13 to instruct display of a file (step S511). If the file of the predetermined file format in the file storage unit 15 is in a format that can be displayed using the function of the file viewer 11 (YES in step S5122), the file operation unit 14 displays the contents of the file. The file viewer 11 is instructed to display on the screen (step S513). However, if the file format is a format that cannot be displayed (step S512, NO), the file operation unit 14 determines the terminal type of the mobile terminal device 1 via the communication control unit 16 and the physical communication interface 17, A file and a file format conversion request for the file are transmitted to the file format conversion server 2 (step S514).

  The file format conversion server 2 receives the terminal type, the file, and the conversion request for the file via the physical communication interface 27 and the communication control unit 26 (step S521). Under the control of the format conversion control unit 21, the file analysis processing unit 22 identifies the file format of the received file based on the file extension (step S522).

  Further, the format selection processing unit 23 selects an appropriate file format according to the terminal type of the mobile terminal device 1 from the correspondence table between the terminal type of the mobile terminal device 1 and the file format (step S523). The file conversion processing unit 24 treats the file received from the mobile terminal device 1 with the file format identified in the process of step S522 as the pre-conversion file format and the file format selected in the process of step S523 as the post-conversion file format. The file is converted into an appropriate file format (step S524). Then, the format conversion control unit 21 transmits the converted file to the mobile terminal device 1 via the physical communication interface 27 and the communication control unit 26 (step S525).

  On the other hand, the mobile terminal device 1 receives the file whose file format has been converted (step S515), and displays the received file on the display unit using the function of the file viewer 11 (step S516).

  FIG. 6 is an explanatory diagram conceptually showing the operation of the file format conversion system when a file is edited by the mobile terminal device 1. FIG. 6 is an explanatory diagram of an operation when a user requests editing of a Word format electronic file that cannot be edited by the file editor 12 of the mobile terminal device 1.

  When the user requests editing of a Word format document on the screen of the mobile terminal device 1 and the document is not opened, the terminal type and file of the mobile terminal device 1 are transmitted to the file format conversion server 2. .

  The file format conversion server 2 identifies the terminal type and file format of the mobile terminal device 1, automatically converts this to an HTML file format compatible with the display format of the mobile terminal device 1, and then to the mobile terminal device 1. Send. Therefore, the file is displayed on the screen of the mobile terminal device 1 in the HTML format that can be edited by the file editor 12 and can be edited.

  Further, the edited file may be automatically reversely converted from the HTML format to the Word format by the file format conversion server 2 again, and displayed on the screen of the portable terminal in the original file format reflecting the correction. it can.

  FIG. 7 is a flowchart showing in more detail the processing procedure of the above-described file format conversion system when a file is edited by the mobile terminal device 1.

  First, the user operates the input unit 13 to instruct file editing (step S711). If the file in the predetermined file format in the file storage unit 15 is in a format that can be edited using the function of the file editor 12 (step S712, YES), the file operation unit 14 displays an editing screen. The editing operation is received from the user (step S713). However, when the file format is a format that cannot be edited (NO in step S712), the file operation unit 14 determines the terminal type of the mobile terminal device 1 and the relevant data via the communication control unit 16 and the physical communication interface 17. A file and a file format conversion request for the file are transmitted to the file format conversion server 2 (step S714).

  The file format conversion server 2 receives a terminal type, a file, and a conversion request for the file via the physical communication interface 27 and the communication control unit 26 (step S721), and performs file analysis under the control of the format conversion control unit 21. The processing unit 22 identifies the file format of the received file by the file extension (step S722).

  Further, the format selection processing unit 23 selects an appropriate file format according to the terminal type of the mobile terminal device 1 from the correspondence table between the terminal type of the mobile terminal device 1 and the file format (step S723). The file conversion processing unit 24 treats the file received from the mobile terminal device 1 with the file format identified in the process of step S722 as the pre-conversion file format and the file format selected in the process of step S723 as the post-conversion file format. The file is converted into an appropriate file format (step S724).

  The conversion history recording unit 25 stores a pair of a file format before conversion and a file format after conversion, and assigns a conversion number assigned to each pair to each file whose file format has been converted in the process of step S724. (Step S725). Thereafter, the format conversion control unit 21 transmits the file format converted file and the conversion number to the mobile terminal device 1 via the physical communication interface 27 and the communication control unit 26 (step S726).

  On the other hand, the mobile terminal device 1 receives the file format converted file and the conversion number from the file format conversion server 2 (step S715). Thereafter, the mobile terminal device 1 edits the format-converted file received in step S715 (step S716).

  As shown in FIGS. 5 and 7, in the file format conversion system of the present embodiment, the file is automatically transferred from the mobile terminal device 1 to the file format conversion server when the user tries to display or edit the file. Since the file format conversion server is transferred and the file format conversion server automatically selects an appropriate file format according to the type of the mobile terminal device 1 and performs conversion, the convenience can be improved.

FIG. 8 is a flowchart showing a processing procedure of the file format conversion system after the file is edited by the mobile terminal device 1.
First, the user instructs the end of the file editing process from the input unit 13 (step S811). The file operation unit 14 of the mobile terminal device 1 checks whether or not a conversion number is assigned to the file that has undergone the editing process (step S812). If there is no conversion number (step S812, NO), the editing process is performed. The file that has been subjected is stored in the file storage unit 15 (step S813). On the other hand, if there is a conversion number (step S812, YES), the conversion number, the edited file, and the reverse conversion request for restoring the file format of the edited file are transmitted to the file format conversion server 2 ( Step S814).

  The file format conversion server 2 receives the conversion number, file, and reverse conversion request via the physical communication interface 27 and the communication control unit 26 (step S821). The format selection processing unit 23 searches for the conversion number, acquires information on the file format before the file format conversion by the processing in step S724 (step S822), and the file analysis processing unit 22 reads the file of the edited file. The format is identified from the file extension (step S823). The file analysis processing unit 22 is described so as to identify the file format of the edited file from the file extension. However, the file analysis processing unit 22 searches for the conversion number and uses the file format information after the file format conversion to determine the file format of the edited file. The file format may be specified.

  Next, the file format of the edited file is converted assuming that the file format acquired in the process of step S822 is the one after conversion, the file format identified in the process of step S823 is the one before conversion (step S824), The format conversion control unit 21 transmits the converted file to the mobile terminal device 1 via the physical communication interface 27 and the communication control unit 26 (step S825).

  The mobile terminal device 1 receives the file whose file format is reversely converted (step S815), and stores the received file in the file storage unit 15 (step S816). As a result, the series of file editing processing in the mobile terminal device 1 can be completed in a state in which the file format is converted back to the pre-conversion file format.

(Second Embodiment)
FIG. 9 is a block diagram showing a file format conversion system according to the second embodiment of the present invention. In addition, the same code | symbol is attached | subjected to the component same as what is shown in FIG. 1, and the duplicate description is abbreviate | omitted.

  In FIG. 9, the pre-conversion format recording unit 18 is added as a memory means to the mobile terminal device 1, while the conversion history recording unit 25 is omitted from the file format conversion server 2. The pre-conversion format recording unit 18 added to the mobile terminal device 1 includes a recording device such as a flash memory, and records the file format of the file to be edited before the file format conversion.

  Next, the operation of this portable file format conversion system will be described. Since the operation of the file format conversion system in the case of file display is executed by the same procedure as that shown in the flowchart of FIG. 5, the redundant description of the operation is omitted here.

  FIG. 10 is a flowchart showing a processing procedure of the file format conversion system when a file is edited by the mobile terminal device 1.

  First, the user operates the input unit 13 to instruct file editing (step S711). If the file in the predetermined file format in the file storage unit 15 is in a format that can be edited using the function of the file editor 12 (step S712, YES), the file operation unit 14 displays an editing screen. Displayed on the screen and accepts an editing operation from the user. However, when the file format is a format that cannot be edited (NO in step S712), the file operation unit 14 determines the terminal type of the mobile terminal device 1 and the relevant data via the communication control unit 16 and the physical communication interface 17. A file and a file format conversion request for the file are transmitted to the format conversion server 2 (step S714).

  The file format conversion server 2 receives a terminal type, a file, and a conversion request for the file via the physical communication interface 27 and the communication control unit 26 (step S721), and performs file analysis under the control of the format conversion control unit 21. The processing unit 22 identifies the file format of the received file based on the file extension (step S722).

  Further, the format selection processing unit 23 selects an appropriate file format according to the terminal type of the mobile terminal device 1 from the correspondence table between the terminal type of the mobile terminal device 1 and the file format (step S723). The file conversion processing unit 24 assumes that the file format identified in the process of step S722 is the one before conversion, the file format selected in the process of step S723 is the one after conversion, and receives the file received from the mobile terminal device 1. The file is converted into an appropriate file format (step S724). Thereafter, the format conversion control unit 21 transmits the file format converted file and the file format information before conversion to the mobile terminal device 1 via the physical communication interface 27 and the communication control unit 26 (step S1021).

  On the other hand, the mobile terminal device 1 receives the file format converted file and the file format information before conversion from the file format conversion server 2 (step S1011), and records the file format before conversion in the format converter 18 before conversion. (Step S1012). Thereafter, the mobile terminal device 1 edits the file whose format has been converted received in the process of step S1011 (step S716).

FIG. 11 is a flowchart showing the processing procedure of the file format conversion system after the file is edited by the mobile terminal device 1.
First, the user instructs the end of the file editing process from the input unit 13 (step S811). The file operation unit 14 of the portable terminal device 1 checks whether or not the file format information before conversion is recorded in the pre-conversion format recording unit 18 (step S1111), and if it is not recorded (step S1111, NO), the file subjected to the editing process is stored in the file storage unit 15 (step S813). On the other hand, when the file format information before conversion is recorded (YES in step S1111), the reverse conversion request for restoring the file format information before conversion, the edited file, and the file format of the edited file to the original ones. Are transmitted to the file format conversion server 2 (step S1112).

  The file format conversion server 2 receives the file format information before the conversion, the edited file, and the reverse conversion request via the physical communication interface 27 and the communication control unit 26 (step S1121). The format selection processing unit 23 extracts the received file format information before conversion and sets it as the output file format to the mobile terminal device 1 (step S1122).

  Further, the file analysis processing unit 22 identifies the file format of the edited file from the file extension (step S823).

  The file conversion processing unit 24 converts the file format of the edited file, assuming that the file format acquired by the process of step S1122 is the one after conversion and the file format identified by the process of step S823 is the one before conversion ( Step S824). Then, the format conversion control unit 21 transmits the converted file to the mobile terminal device 1 via the physical communication interface 27 and the communication control unit 26 (step S825).

  The mobile terminal device 1 receives the file whose file format is reversely converted (step S815), and stores the received file in the file storage unit 15 (step S816).

  As described above, even if the file format has been converted once, since the mobile terminal device 1 records the file format before conversion, the file format is automatically restored to the original file format when the user finishes editing. Can be converted (reverted). As a result, the series of file editing processing in the mobile terminal device 1 can be completed in a state in which the file format is converted back to the pre-conversion file format.

  In the first embodiment and the second embodiment of the present invention, the case of a mobile phone network and a wireless LAN network has been described. However, the present invention naturally applies to any network regardless of wired or wireless. It is equally effective. For example, the present invention can be similarly applied to the general Internet, WLAN (Wide Area Network), wireless MAN (Metropolitan Area Network), wireless PAN (Personal Area Network), and the like.

  The file format handled by the format conversion system of the present invention is not limited to the text, HTML, PDF, and Word formats described in the first and second embodiments of the present invention, and any file format is targeted. . This includes audio, images and video. That is, all data that can be handled as a file is subject to the format conversion system of the present invention.

  According to the file format conversion server, the mobile terminal device, and the file format conversion system of the present invention, the file format that can be displayed or edited by the mobile terminal device without performing the file format registration process in the file format conversion server. The portable terminal device can receive the electronic file, and after the portable terminal device edits the electronic file received from the file format conversion server, the edited electronic file is converted into a format before conversion by the file format conversion server. This is useful in the field of automatically converting various file formats of electronic files into predetermined file formats that can be displayed or edited by a portable terminal device.

The block diagram which shows the file format conversion system of the 1st Embodiment of this invention Conceptual diagram of the file format conversion system of the present invention Conceptual diagram of another file format conversion system of the present invention Explanatory drawing which shows notionally operation | movement of the file format conversion system of this invention The flowchart which shows the operation | movement procedure at the time of the file display in the file format conversion system of the 1st Embodiment of this invention Explanatory drawing which shows notionally another operation | movement of the file format conversion system of this invention The flowchart which shows the operation | movement procedure at the time of file editing in the file format conversion system of the 1st Embodiment of this invention The flowchart which shows the operation | movement procedure after completion | finish of file editing in the file format conversion system of the 1st Embodiment of this invention. The block diagram which shows the file format conversion system of the 2nd Embodiment of this invention The flowchart which shows the operation | movement procedure at the time of file editing in the file format conversion system of the 2nd Embodiment of this invention The flowchart which shows the operation | movement procedure after completion | finish of file editing in the file format conversion system of the 2nd Embodiment of this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Mobile terminal device 2 File format conversion server 3 Network 4 Base station 5 Gateway 6 Access point 11 File viewer 12 File editor 13 Input part 14 File operation part 15 File storage part 16 Communication control part 17 Physical communication interface 18 File format recording before conversion Section 21 Format conversion control section 22 File analysis processing section 23 Format selection processing section 24 File conversion processing section 25 Format history recording section 26 Communication control section 27 Physical communication interface

Claims (12)

A file format conversion server that converts electronic data of an arbitrary file format into an electronic file of another file format,
First storage means for storing a correspondence relationship between various portable terminal devices and file formats that can be processed by various portable terminal devices;
First receiving means for receiving an electronic file and information on the terminal type of the mobile terminal device from a mobile terminal device capable of data processing of an electronic file of at least one file format;
Selecting means for selecting a file format corresponding to a terminal type of the portable terminal device with reference to the correspondence stored in the first storage means;
Converting means for converting the electronic file received by the first receiving means into an electronic file of the file format selected by the selecting means;
First transmission means for transmitting an electronic file whose file format has been converted by the conversion means to the mobile terminal device;
A file format conversion server comprising: A portable terminal device capable of data processing of an electronic file of at least one file format,
Second transmission means for transmitting the electronic file and information on the terminal type of the mobile terminal device to a file format conversion server that converts electronic data of an arbitrary file format into an electronic file of another file format;
Second receiving means for receiving an electronic file whose file format has been converted by the file format conversion server from the file format conversion server;
A mobile terminal device comprising: The mobile terminal device according to claim 2,
The second transmitting means is a portable terminal device that transmits to the file format conversion server an electronic file having a file format that cannot be processed by the portable terminal device, and information related to a terminal type of the portable terminal device.   A file format conversion system comprising the file format conversion server according to claim 1 and the portable terminal device according to claim 2 or 3. The file format conversion server according to claim 1,
The conversion means assigns conversion identification information to the electronic file for each conversion of the electronic file by the conversion means,
The first transmission means is a file format conversion server for transmitting an electronic file to which conversion identification information is assigned by the conversion means. The file format conversion server according to claim 5,
Correspondence between the combination of the file format of the electronic file before conversion by the conversion means and the file format of the electronic file after conversion by the conversion means, and the conversion identification information assigned to the electronic file converted by the conversion means Second storage means for storing the relationship;
Detecting means for detecting that the electronic file received by the first receiving means is an electronic file that has been converted by the converting means with reference to the conversion identification information stored in the second storage means; ,
When the detecting means detects, the converting means converts the electronic file received by the first receiving means into a file format before conversion of the electronic file with reference to the combination stored in the second storing means. File format conversion server. The mobile terminal device according to claim 2 or 3,
The second receiving means receives an electronic file to which conversion identification information is assigned from the file format conversion server,
The mobile terminal device, wherein the second transmission means transmits an electronic file subjected to data processing after being received by the second reception means.   A file format conversion system comprising the file format conversion server according to claim 5 and the mobile terminal device according to claim 7. The file format conversion server according to claim 1,
The first transmission means is a file format conversion server for transmitting an electronic file whose file format has been converted by the conversion means and file format information before the electronic file conversion by the conversion means. The file format conversion server according to claim 9,
The first receiving means receives an electronic file and file format information before the electronic file conversion,
The conversion unit is a file format conversion server that converts the electronic file received by the first receiving unit into a file format before conversion of the electronic file based on file format information before conversion of the electronic file. The mobile terminal device according to claim 2 or 3,
The second receiving means receives, from the file format conversion server, an electronic file whose file format has been converted by the file format conversion server, and file format information before the electronic file conversion,
The second transmission unit is a portable terminal device that transmits an electronic file that has been subjected to data processing after being received by the second reception unit, and file format information before the electronic file conversion.   A file format conversion system comprising the file format conversion server according to claim 9 and the portable terminal device according to claim 11.

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