WO2001046813A1

WO2001046813A1 - Communication system for downloading structured document

Info

Publication number: WO2001046813A1
Application number: PCT/JP2000/009141
Authority: WO
Inventors: Kenji Takeda; Naoko Ito
Original assignee: Nec Corporation
Priority date: 1999-12-22
Filing date: 2000-12-22
Publication date: 2001-06-28
Also published as: AU2401201A; JP2001175549A

Abstract

Structured documents in each of which unit documents are related to one another hierarchically are stored in a server device (2). A terminal device (1) acquires and displays one of the structured documents. The server device (2) and the terminal device (1) are interconnected through a network (3) to constitute a communication system. The terminal device (1) notifies the server device (2) of the identifier of a document that the user gives an instruction to display. The server device (2) sends the next document of the document. The sent next document is stored in the terminal device (1). Thus while maintaining the high-speed display of the next document on the terminal device (1), the efficiency of data transfer between the terminal device (1) and the server device (2) is improved.

Description

Description Communication system for downloading structured documents

The present invention relates to a communication system for downloading a structured document, a communication method therefor, and a recording medium recording a communication control program therefor, and more particularly to a storage device (for example, a server device) connected to a network. The present invention relates to a communication system for downloading stored structured documents via a network, a communication method thereof, and a recording medium on which a communication control program is recorded. Background art

In recent years, by using a mobile terminal to access a server device connected to a network (particularly the Internet), a document (document data representing a document) stored in the server device is obtained (downloaded). However, there has been proposed a system for displaying acquired documents on a display device. The document stored in the server device is usually a structured document in which a plurality of documents (unit documents) are associated (hierarchized) with each other. In such a system, (1) the next document display instruction by the user's selection and input operation, (2) the document transmission request from the portable terminal to the server device, (3) the request from the server device to the portable terminal The document supply service is provided by repeating the transmission of the received document and (4) the reception and display of the document on the mobile terminal. Such a system is characterized in that the provided service is bidirectional (interactive). Therefore, the display of the next document specified by the user from the display instruction of the next document made by the user. It is important to shorten the time required to display the information on the website in order to improve the serviceability for users.

FIG. 1 is a diagram showing an example of the configuration of a conventional communication system for transmitting and receiving a structured document. As shown in FIG. 1, this communication system includes a mobile communication network M, a mobile terminal connected to the mobile communication network M, a network N to which server devices S1 and S2 are connected, and a mobile communication network. A network that connects communication network M and network N to each other. One-way device G is included.

When a user accesses the server device S1 or S2 (here, S1) using the mobile terminal T, the mobile terminal T is connected to the gateway device G via the mobile communication network M, and the gateway device is used. G is connected to server device S1 via network N. Communication between the terminal device T and the gateway device G is performed based on a communication protocol group optimized for the characteristics of the mobile communication network M and the portable terminal T. An example of the communication protocol group is WAP (Wireless Application Protocol). The communication between the server device S1 and the gateway device G is performed according to the standard protocol of the network N. For example, if the network N is the Internet, between the server device S1 and the gateway G, the standard Internet protocols HTTP (Hyper-Text Transfer Protocol), TCP / IP ( Transmission Control Protocol The communication power is based on the Internet Protocol. This gateway device G has a function for performing protocol conversion between WAP and a standard protocol used in the network N and a data format conversion (for example, HTML (Hyper-Text Markup (Language) format document data and the WML (Wireless Markup Language) format document data used in WAP).

Here, WML which is a standard language of WAP which is a communication protocol between the gateway device G and the mobile terminal T will be described. WML is a markup language for devices such as mobile phones and PDAs (Personal Digital Assistant) that have a limited bandwidth and display size (information such as layout information and text size / decoration in document data). Language for embedding and displaying or printing on the screen).

WML documents have concepts called "cards" and "deck". In WML, a document for one page displayed on the display of a mobile terminal is called a force, and a set of cards sent from the server device to the mobile terminal in one transmission is called a deck.

If a series of documents (cards) necessary to provide a certain service is collected as one deck, the server device S can be used while the user is using the service. The data communication between the mobile terminal T and the mobile terminal T becomes unnecessary. That is, when the user requests the provision of a certain service, the terminal device T downloads (download) all the data of the deck corresponding to the service from the server device S1 at that time. It is stored in the built-in memory. The process of changing the force displayed on the mobile terminal T while the user uses the service is realized only by the internal processing of the mobile terminal T. During this time, the mobile terminal T does not need to access the server device S, so that the user can enjoy high-speed service execution.

Next, the operation of the communication system having the above configuration will be described with reference to the sequence diagram of FIG.

First, in response to a document acquisition instruction from the user (in this case, the deck D is specified), the mobile terminal T sends a request to acquire the specified document (deck D) to the mobile communication network M, The data is transmitted to the server device S1 via the gateway device G and the network N. Upon receiving the request to acquire the deck D, the server device S1 retrieves all the document data of the deck D from its storage device, and retrieves all the retrieved document data of the deck D from the network N, the gateway device G, and the mobile communication. Transmit to terminal T via network M. The terminal device T stores the received document data of the deck D in the storage unit, extracts the document data of the card to be displayed first (card C 1) from the document data of the deck D, and displays the document data on the display unit. I do.

Next, when the user performs a selection and input operation on the mobile terminal T and gives a document acquisition instruction for the next document (the card C2 included in the deck D), the mobile terminal T is instructed. After confirming that the document (Card C 2) contained in Deck D is stored in the storage unit, the document data of C2 is retrieved from the stored document data of Deck D. Display card C2 on the display. Further, when the portable terminal receives a document acquisition instruction of the next document (the card C4 included in the deck D) by the user's selection and input operation, the portable terminal T stores the same as above. The document data of card C4 is retrieved from document D stored in the display unit and displayed on the display unit.

Other conventional communication systems are disclosed in Japanese Patent Application Publication · Heisei 11-191082 Publication (hereinafter referred to as Reference 1) and Japanese Patent Application Publication · Heisei 11 _1966215 Each is disclosed in the official gazette (hereinafter referred to as Reference 2). Technology disclosed in Reference 1 Then, if an identification image indicating the link destination to another web page is attached to the web page to be transmitted to the mobile terminal, the relay device replaces the identification image with text indicating the link destination. By pasting the information on the web page, the amount of data sent to the mobile terminal is reduced. In the technology disclosed in Reference 2, the fax image data received by the in-house FC is transferred to the mobile terminal in units of a size corresponding to the memory capacity of the mobile terminal. Fax image data can be received.

The problem with the conventional technology is that it wastes network bandwidth. The reason is that, in response to a document (deck) acquisition request from a mobile terminal, the server device transmits all the data of the requested deck in a lump, so that the document (deck) transmitted from the server device is transmitted. This is because some documents (cards) are not selected (displayed) by the user as a result. The technology for preventing the transfer of such useless documents (cards) is not disclosed in either of References 1 and 2 above.

Accordingly, an object of the present invention is to provide a communication system, a communication method, and a communication control program for downloading a structured document capable of providing a high-speed service and preventing wasteful consumption of network bandwidth. An object of the present invention is to provide a recorded recording medium. Disclosure of the invention

A first feature of the present invention for solving the above problem is a communication system in which a terminal device acquires a structured document stored in a server device via a network. A next document transmitting means for transmitting, from the server device to the terminal device, a second unit document associated as a document following the already obtained first unit document.

Also, a second feature of the present invention is a communication method in which a terminal device acquires a structured document stored in a server device via a network, wherein the terminal device has already acquired the structured document. And transmitting a second unit document associated as a unit document next to the one unit document from the server device to the terminal device. Furthermore, a third feature of the present invention resides in a recording medium on which a terminal device records a communication control program for acquiring a structured document stored in a server device via a network, A control program including a next document transmission step of transmitting a second unit document associated as a next unit document following the first unit document already acquired by the server device to the terminal device is recorded. That is.

According to the first to third aspects of the present invention, a second unit document, which is a unit document next to a first unit document already acquired by a terminal device, is transmitted from the server device to the terminal device. With this configuration, it is possible to prevent the network bandwidth from being wasted.

More specifically, the first communication system of the present invention provides a document display for notifying a server device (2) of a document identifier of a unit document instructed to be displayed on a portable terminal (1) by a user. Unit 12 and the document request transmission unit (13) (see FIG. 3), and the mobile terminal (1) sends a unit document that can be displayed next to the unit document identified by the document identifier notified to the server device (2). )) And a document transmitting section (2 3) (see FIG. 3). By adopting such a configuration, the object of the present invention can be achieved by transmitting the next document from the server device as needed when the user instructs the display of the document.

The second communication system of the present invention includes a document display unit (12) for notifying the server device 7 of a document identifier of a unit document instructed to be displayed on the mobile terminal (1) by the user, and a document request transmission. Unit (13) (see Fig. 8) and the relay device (5) to transfer the structured document transmitted from the server device (7) to the mobile terminal (1) to the mobile terminal (1). In response to the notification of the document identifier from the document storage unit (54) (see Fig. 8) and the portable terminal (1), the document is displayed next to the unit document identified by the notified document identifier. It has a next document discriminator (52) for transmitting the obtained unit document to the portable terminal (1) and a document transmitter (53) (see Fig. 8). By adopting such a configuration, the structured document is stored in the relay device (5), and the next document is transmitted from the relay device (5) as needed when the user instructs the display of the document. The object of the invention can be achieved.

A third communication system according to the present invention is a communication system in which a user instructs a portable terminal (1) to display a sentence. It has a next document discriminator (16) and a document request transmitter (13) (see FIG. 11) for notifying the server device (2) of the document identifier of the document that can be displayed next to the document. Adopting such a configuration, when the user instructs the display of a document, the next document corresponding to the next document is transmitted from the server device (2) at any time in response to a request from the terminal device (1). Thereby, the object of the present invention can be achieved. BRIEF DESCRIPTION OF THE FIGURES

FIG. 1 is a configuration diagram of an example of a conventional communication system for downloading a structured document,

FIG. 2 is a sequence diagram for explaining the operation of the communication system of FIG. 1, and FIG. 3 is a communication diagram for downloading a structured document according to the first embodiment of the present invention. It is a configuration diagram of a system,

FIG. 4 is a schematic explanatory view showing an example of the configuration of the deck.

5A, 5B, and 5C are diagrams showing an example of the configuration of each message. FIG. 6 is a sequence diagram for explaining the operation of the communication system in FIG. FIG. 7 is a flowchart showing an outline of the operation of the communication system of FIG. 3, FIG. 8 is a configuration diagram of a communication system according to a second embodiment of the present invention, FIG. FIG. 10 is a sequence diagram for explaining the operation of the communication system of FIG. 8; FIG. 10 is a flowchart showing an outline of the operation of the communication system of FIG. 8; FIG. 12 is a configuration diagram of a communication system according to a third embodiment; FIG. 12 is a sequence diagram for explaining an operation of the communication system of FIG. 11;

FIG. 13 is a flowchart showing an outline of the operation of the communication system of FIG.

FIG. 14 is a configuration diagram of an example of a recording medium driving device. BEST MODE FOR CARRYING OUT THE INVENTION

Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings.

First, a first embodiment will be described. FIG. 3 shows a first embodiment of the present invention. 1 is a configuration diagram of a communication system for downloading (or supplying) a structured document according to an embodiment. Referring to FIG. 3, this communication system includes a mobile terminal 1, a server device 2, and a network 3, and the mobile terminal 1 and the server device 2 are connected to each other via a network 3. ing.

The mobile terminal 1 includes a selection unit 11, a document display unit 12, a document request transmission unit 13, a document reception unit 14, and a document storage unit 15. The selection unit 11 monitors a user's operation on an input device such as a button provided in the mobile terminal 1 and notifies the document display unit 12 of the user's button operation.

For example, in the WAF, functions such as accept (accept), move to previous card (prev), and help (help) are assigned to each button of the mobile terminal. Here, the selection unit 11 monitors the operation of the user on the button of the mobile terminal 1. When the user presses a button to which the reception function is assigned, for example, the reception event is displayed in a document. Notify Part 1 and 2.

The document display unit 12 displays the contents of the document on a display device (not shown) of the mobile terminal 1 and allows the user to perform the operation based on the user operation notified by the selection unit 11 and the contents of the displayed document. Specify the document to be displayed next to the specified one (referred to as the next document). The document display unit 12 further checks whether or not the next document is stored in the document holding unit 15. When the next document is stored in the document holding unit 15, the document display unit 12 reads out the next document from the document holding unit 15, displays the next document on a display device, and displays the next document on the display device. The document request transmitting unit 13 is notified of the document identifier and the next document acquisition request for requesting acquisition of the next document. If the next document is not stored in the document holding unit 15, the document display unit 12 notifies the document request transmitting unit 13 of the document identifier of the next document and a document acquisition request.

For example, in WAP WML, it is possible to define actions for events such as acceptance, previous card movement, and help for each card (unit document) and deck (structured document). Here, when the document display section 12 displays a certain card and the selection section 11 notifies the occurrence of a certain event, the document display section 12 determines the action definition for the notified event. It reads from the data of the first node and performs the corresponding processing (determination of the next document, display of the next document, display of the previous document, etc.). Upon receiving the document acquisition request accompanied by the document identifier notified by the document display unit 12 or the next document acquisition request, the document request transmission unit 13 respectively receives a document acquisition request message including the document identifier, Alternatively, a next document acquisition request message is created, and the document acquisition request message or the next document acquisition request message is transmitted to the server device 2 that stores these documents.

The document receiving unit 14 receives the document data transfer message transmitted from the server device 2 and extracts a set of the document identifier and the document data included in the document data transfer message. The document receiving section 14 stores the set of the document identifier and the document data in the document holding section 15 and notifies the document display section 12 of the reception of the document. The document holding unit 15 stores a set of the acquired document identifier and document data.

The server device 2 includes a document request receiving unit 21, a next document discriminating unit 22, a document transmitting unit 23, and a document storage unit 24. The document request reception unit 21 receives the next document acquisition request message or the document acquisition request message from the document request transmission unit 13. The document request receiving unit 21 extracts the next document acquisition request message or a document identifier included in the document acquisition request message, and determines the next document acquisition request accompanied by the document identifier or the next document acquisition request as the next document. Notify Part 22.

When notified of the document acquisition request accompanied by the document identifier from the document request receiving unit 21, the next document determination unit 22 reads out the document data corresponding to the document identifier from the document storage unit 24. The next document determination unit 22 determines, from the contents of the document data, the document identifiers of all the documents that are the next documents of the document identified by the document identifier, and determines the document identifiers and all the documents determined as the next document. The identifier is notified to the document transmission unit 23.

When notified of the next document acquisition request with the document identifier from the document request receiving unit 21, the next document determination unit 22 reads the document data corresponding to the document identifier from the document storage unit 24. The next document determining unit 22 determines, from the contents of the document data, the document identifiers of all documents that are the documents following the document identified by the document identifier, and sends all document identifiers determined as the next document to the document transmitting unit 2. Notify 3.

When one or more document identifiers are notified from the next document determination unit 22, the document transmission unit 23 reads the document data corresponding to the notified document identifier from the document storage unit 24, and notifies Data transfer including all document identifier and document data pairs Create a message. The document transmitting unit 23 transmits the document data transfer message to the mobile terminal 1 via the network 3. The document storage unit 24 is a unit that stores document data, and stores a set of a document identifier and document data of the document. Network 3 is a communication network for providing data communication services such as an Internet telephone network and a mobile communication network.

Here, a structured document used in the communication system will be described. In this embodiment (the same applies to other embodiments described later), the above-mentioned documents include HTML documents, Standard Generalized Markup Language (SGML) documents, Extensible Markup Language (XML) documents, and Wireless Markup Language (WML) documents. And so on. In particular, like a WML document, a document (unit document: called "force" in WML) displayed in one screen display and a document having a plurality of the unit documents (cards) (structured document: in WML) A structured document including two types of documents (called a deck) is suitable for the present embodiment.

A WML document is structured and defined in a deck with a plurality of forces related by display order. FIG. 4 is a schematic diagram showing an example of the configuration of a deck. As shown in FIG. 4, Deck D is composed of, for example, cards C1, C2, C3, C4, C5, C6, and C7. Card C 1 is the first card displayed when Deck D is specified. Card C1 defines Card C2 and Card C3 as the next documents. The events “button 1 pressed” and “button 2 pressed” are defined for the cards C 2 and C 3 as conditions for moving to the next document, respectively. Similarly, Card C2 defines Card C4 and Card C5 as the next documents. For events C4 and C5, the events "button 1 pressed" and "button 2 pressed" are defined as conditions for moving to the next document, respectively. Card C3 defines Card C6 and Card C7 as the next documents. For the cards C6 and C7, the events "button 1 pressed" and "button 2 pressed" are defined as conditions for moving to the next document, respectively. Each of these decks and cards has a document identifier that identifies each deck and card. The document identifier is added to or included in the document data making up the deck or card. The document identifier stores the document data of the corresponding document. It contains information for identifying the server device and is used to identify the corresponding document. That is, a document existing on the network can be uniquely specified by the document identifier.

Here, the structure of the document acquisition request message, the next document acquisition request message, and the document data transfer message will be described. FIGS. 5A to 5C are diagrams showing examples of the configuration of each message. FIG. 5A shows a configuration example of a document acquisition request message. FIG. 5B shows a configuration example of the next document acquisition request message. Figure 5C shows an example of the structure of a document data transfer message. As shown in FIGS. 5A, 5B and 5C, each message initially has a message type field. The document retrieval request message shown in Fig. 5A has a value ("1" in Fig. 5.A) indicating that it is a document retrieval request message in the message type field, and the document identifier following the message type field. Has one field for storing The next document acquisition request message in Fig. 5B has a value ("2" in Fig. 5B) indicating that it is a next document acquisition request message in the message type field, and stores the document identifier following the message type field. Has one or more fields, or none. The document data transfer message in Fig. 5C has a value indicating that it is a document data transfer message ("3" in Fig. 5C) in the message type field, and the document following the message type field. It has one or more fields to store a set of an identifier and the document data corresponding to this document identifier, or has no field.

Next, the operation of the communication system according to the first exemplary embodiment of the present invention will be described with reference to FIG. 6 together with FIG. 3 and FIG. FIG. 6 is a sequence diagram for explaining the operation of the communication system according to the first embodiment of the present invention. Here, it is assumed that the document holding unit 15 of the mobile terminal 1 does not store any document data of the deck D including the cards C1 to C7.

First, the user operates the button of the terminal device 1 to instruct the terminal device 1 to acquire the deck D (sequence X 1). The selection unit 11 monitors the button operation and notifies the document display unit 12 that an event has occurred.

The document display section 12 confirms that the acquisition instruction for the deck D has been issued based on the content of the event notified from the selection section 11 and the content of the document currently displayed on the terminal device 1. Understand. Then, the document display unit 12 checks whether the document data of the deck D is stored in the document holding unit 15 using the document identifier of the deck D. Here, since the document holding unit 15 does not store the document data of Deck D, the document display unit 12 notifies the document request transmitting unit 13 of the document identifier of Deck D and the document acquisition request.

When notified of the document acquisition request from the document display unit 12, the document request transmission unit 13 creates a document acquisition request message including the notified document identifier of Deck D, and sends the document acquisition request message to the network. (The document reception request section 21 receives the document acquisition request message and transmits the document acquisition request together with the document identifier of the deck D included in the document acquisition request message to the next document.) Notify Judgment Division 22.

When the document acquisition request is notified, the next document determination unit 22 reads out the document data corresponding to the notified document identifier of the deck D from the document storage unit 24, and reads the document data of the deck D from the contents of the first. Is determined to be card C1. Next, the next document determination unit 22 determines from the content of the document data of the card C1 that the force C2 and the card C3 are defined as the next documents of the card C1. Then, the next document determination unit 22 notifies the document transmission unit 23 of the document identifiers of the cards C1, C2, and C3.

When notified of the card C1, C2, and C3 document identifiers, the document transmission unit 23 reads the document data corresponding to each document identifier from the document storage unit 24, and reads the cards C1, C2. ,, And C3, and a document data transfer message including a set of document data corresponding to each of the document identifiers is created. The document transmission section 23 transmits the document data transfer message to the portable terminal 1 via the network 3 (sequence X 3).

Upon receiving the document data transfer message, the document receiving unit 14 sets the document identifiers of the cards C1, C2, and C3 from the document data transfer message and sets of document data respectively corresponding to these document identifiers. Then, a set of the retrieved document identifier and document data is stored in the document holding unit 15. Then, the document reception unit 14 notifies the reception of the card C 1 (deck D) to the document display unit 12. The document display unit 12 notified of the reception of the card CI (deck D) reads the document data of the card C1 from the document holding unit 15 from the document holding unit 15 and displays the document data of the card C1 on the display device. (Sequence X 4).

Here, it is assumed that the user browses the display of card C1 and presses button 1 (sequence X5). At this time, the selection unit 11 detects the button 1 pressing operation of the user and notifies the document display unit 12 of the occurrence of the button 1 pressing event.

Upon receiving the notification of the occurrence of the button 1 press event, the document display unit 12 identifies the card C 2 as the next document based on the meaning of the button 1 press event and the content of the document data of the card C 1 and holds the document. It is checked whether or not the document data of the card C2 is stored in the part 15.

In this case, since the document data of the card C 2 is stored in the document holding unit 15, the document display unit 12 reads out the document data of the card C 2 from the document holding unit 15 and C2 is displayed on the display device (sequence X6). Further, the document display unit 12 notifies the document request transmission unit 13 of the document identifier of the input C2 and the request for acquiring the next document. When notified of the next document acquisition request from the document display unit 12, the document request transmission unit 13 creates a next document acquisition request message including the notified document identifier of the card C 2, and the next document acquisition request message Is transmitted to the server device 2 via the network 3 (sequence X7).

When receiving the next document acquisition request message, the document request reception unit 21 notifies the next document determination unit 22 of the document identifier of the card C2 and the next document acquisition request included in the next document acquisition request message. .

When notified of the next document acquisition request, the next document determination unit 22 reads out the document data corresponding to the notified document identifier of the card C 2 from the document storage unit 24 and checks the next document of the card C 2. Then, when the next document determining unit 22 determines that the cards C 4 and C 5 are defined as the next documents of the card C 2, the document identifiers of the cards C 4 and C 5 are transmitted to the document transmitting unit 23. Notice.

When notified of the document identifiers of the cards C 4 and C 5, the document transmitting unit 23 reads out the document data corresponding to each document identifier from the document storage unit 24, and reads the documents of the cards C 4 and C 5. Identifiers and document data corresponding to these document identifiers (next document data Create a document data transfer message that includes Then, document transmitting section 23 transmits the document data transfer message to portable terminal 1 via network 3 (sequence X 8) ₀

When receiving the document data transfer message, the document receiving unit 14 extracts the document identifiers of the keys C4 and C5 and the set of the document data corresponding to these identifiers from the document data transfer message, and retrieves them. The set of the document identifier and the document data is stored in the document holding unit 15. Then, the document receiving unit 14 notifies the document display unit 12 of the reception of the cards C4 and C5.

Thereafter, it is assumed that the user browses the display of card C2 and presses button 2 (sequence X9). Also in this case, as described above, the selection unit 11 notifies the document display unit 12 of the occurrence of the event of pressing the button 2. The document display unit 12 specifies the card C5 as the next document based on the meaning of the button 2 press event and the content of the document data of the force C2, and the document of the card C5 is stored in the document holding unit 15. Check whether data is stored. In this case, since the document storage unit 15 stores the document data of the card C5, the document display unit 12 reads the document data of the card C5 from the document storage unit 15 and displays the card C5. Display on the device (sequence X 10). Further, the document display unit 12 notifies the document request transmission unit 13 of the document identifier of the card C5 and the request for acquiring the next document. The document request transmission unit 13 creates a next document acquisition request message including the document identifier of the card C5, and transmits the next document acquisition request message to the server device 2 via the network 3 (sequence XI1) .

Upon receiving the next document acquisition request message, the server device 2 operates in the same manner as described above. In this case, since the next document of card C5 does not exist, server device 2 transmits a document data transfer message not including the set of the document identifier and the document data to portable terminal 1 via network 3. (Sequence XI 2).

FIG. 7 is a flowchart showing an outline of the operation of the communication device according to the first embodiment. Referring to FIG. 7, first, the portable terminal 1 transmits a request for acquiring the deck D to the server 2 (S 1). Next, the server 2 transmits the cards C1, C2, and C3 in the deck D to the portable terminal 1 (S2). Next, C2 is selected next to card C1 in mobile terminal 1 (S3). Next, the portable terminal 1 sends the document of the force C 2 to the server 2. A next document acquisition request message including the identifier is transmitted (S4). Next, cards C4 and C5 are determined as the next document of the card C2 in the server 2 (S5). Next, the server 2 sends the cards C 4 and C 5 to the mobile terminal 1 (S 6).

As described above, in this communication system, since the mobile terminal 1 holds the document data of the next document, the high-speed response from the user's operation of the mobile terminal to the display of the next document is performed as in the past. Is achieved. In addition, the mobile terminal 1 notifies the server device 2 of the document identifier of the card selected for display, and the server device 2 transmits data corresponding to the next document of the selected card to the mobile terminal 1 so that the deck can be displayed. Compared to transmitting all data, the amount of document data transferred can be reduced, and the load on the network can be reduced.

In the first embodiment of the present invention, when a display of a document having no next document is requested (the above description corresponds to a display request of the card C5), the same as when a next document exists. In the document display section 12 of the mobile terminal 1, the presence or absence of the next document is checked, and if the next document does not exist, the document request transmission section 13 does not issue the next document acquisition request. It may be. If the next document determination unit 22 of the server device 2 detects that the next document of the requested document acquisition does not exist, the document transmission unit 23 may not be notified. . In this case, the number of transmitted messages and the amount of transmitted data between the terminal device 1 and the server device can be reduced.

Further, in the first embodiment of the present invention, although the next document discriminating unit 22 notifies the document transmitting unit 23 of all the document identifiers of the discriminated next document, the next document discriminating unit 22 does not. The number of document identifiers to be notified to the document transmitting unit 23 may be limited, or information indicating the maximum document size may be added to the document identifier. When the number of document identifiers is limited, the next document identifier may be selected based on the statistical information of the past next document selection history. For example, if the next document of card C1 is card C2 and card C3, and the maximum number of documents specified from terminal device 1 is 1, next document discriminating unit 2 2 will use card C2 or force code. The document transmitting unit 23 is notified of one of the document identifiers C3. If the mobile terminal 1 consumes storage resources in card units to store the received document data, the maximum number of documents is the number of storage resources provided in the mobile terminal 1 or available at that time. By specifying the number of storage resources, the storage resources of the mobile terminal 1 can be used effectively. Can be

Also, for example, the following documents of card C1 are card C2 and card C3, and the maximum document size specified from mobile terminal 1 is larger than the document data size of either card C2 or card C3, and If the document data size is smaller than the sum of the two document data sizes, the next document discriminator 22 notifies the document identifier of either card C 2 or card C 3 or card C 2 or card C 3 The document transmitting unit 23 is notified of both the document identifiers and the data size of each card (all of one of them and part of the other card). If network 3 has a limit on the number of data that can be accommodated in one packet (maximum transfer size), specify this maximum transfer size as the maximum document size when transmitting data from server device 2 to mobile terminal 1. By doing so, the number of packets flowing through the network 3 can be reduced. .

When a part of the document data of the card C2 or the card C3 is transmitted to the mobile terminal 1, the document display unit 12 of the mobile terminal 1 stores the part of the card C2 or the card C3 in the document holding unit. When the data is read from 15, the document display unit 12 is configured to request the document request transmission unit 13 to request the server device 2 for the remaining part of the document data of the card C 2 or card C 3. Is also good.

Further, for example, if the next documents of card C1 are card C2 and card C3, and the selection ratio of past card C1 to force C2 and C3 is x% and y%, respectively, The document discriminating unit 22 sets x% for the card C 2 and y% for the card C 3 as the ratio of the number of times of notifying the document transmitting unit 23 of the document identifier of the card C 2 and the card C 3. As described above, by optimizing the document data transmitted from the server device 2 to the mobile terminal 1 according to the frequency of use by the user, the amount of transmitted data can be reduced.

Further, in the first embodiment of the present invention, a configuration in which one mobile terminal 1 and one server device 2 are included is shown, but the communication system includes a plurality of mobile terminals and a plurality of server devices. May be. In this case, a unique identifier (or address) is assigned to all mobile terminals and server devices in order to identify each mobile terminal and each server device. The identifiers assigned to the mobile terminal and the server device are used to identify the source and destination of the message. Next, a communication system according to a second embodiment of the present invention will be described with reference to FIG. 8 and FIG. FIG. 8 is a configuration diagram of a communication system according to the second embodiment. FIG. 9 is a sequence diagram for explaining the operation of the communication system of FIG. In the communication system of the first embodiment described above, direct communication is performed between the portable terminal 1 for displaying document data and the server device 2 storing the document data. On the other hand, in the communication system according to the second embodiment, the gateway device 5 is provided between the mobile terminal 1 and the server device 7, and performs determination of a next document and transfer management of document data of the next document. According to this configuration, an existing server device can be used as the server device 7.

As shown in FIG. 8, the communication system according to the second embodiment of the present invention includes a mobile terminal 1, a gateway device 5, a server device 7, a network 4, and a network 6. It is comprised including. The mobile terminal 1 and the gateway device 5 are connected to each other via a network 4. The gateway device 5 and the server device 7 are connected to each other via a network 6. The mobile terminal 1 has exactly the same configuration and functions as the mobile terminal 1 of the above-described first embodiment, and thus the description is omitted here.

The gateway device 5 includes a document request receiving unit 51, a next document discriminating unit 52, a document transmitting unit 53, and a document holding unit 54. The document request reception unit 51 receives the document acquisition request message from the document request transmission unit 13 and notifies the next document determination unit 52 of a document acquisition request accompanied by the document identifier included in the document acquisition request message. Then, the document acquisition request message is transmitted to the server device 7.

The document request receiving section 51 also receives the next document acquisition request message from the document request transmitting section 13 and sends the next document acquisition request accompanied by the document identifier included in the next document acquisition request message to the next document determination section. 5 Notify 2.

When receiving the document acquisition request accompanied by the document identifier from the document request receiving unit 51, the next document determination unit 52 stores the document identifier. Thereafter, upon receiving the document data transfer message from the document transmitting unit 72, the next document discriminating unit 52 stores all the sets of document identifiers and document data included in the document data transfer message in the document holding unit 54. Store. Then, the next document discriminating unit 52 is notified from the document request receiving unit 51 described above. From the contents of the document data corresponding to the document identifier, the document identifiers of all the documents following the document identified by the document identifier are determined. Further, the next document discriminating unit 52 discriminates the document identifier notified from the document request receiving unit 51 (if this document identifier corresponds to a deck, the document identifier of the card displayed first) as the next document. Notify all the document identifiers to the document transmitting unit 53.

When the next document determination unit 52 is notified of the next document acquisition request accompanied by the document identifier from the document request receiving unit 51, it reads the document data corresponding to the document identifier from the document holding unit 54. Then, the next document determination unit 52 determines the document identifiers of all documents that are the next documents of the document identified by the document identifier based on the content of the document data, and corresponds to the document determined as the next document. The document transmitting unit 53 is notified of all the document identifiers to be transmitted.

When one or more document identifiers are notified from the next document discriminating unit 52, the document transmitting unit 53 reads out the document data corresponding to the notified document identifier from the document holding unit 54, and notifies the document data. Create a document data transfer message that includes all the document identifiers and document data sets. Then, the document transmitting section 53 transmits the document data transfer message to the portable terminal 1 via the network 4.

The document holding unit 54 is a means for temporarily storing a set of a document identifier and document data of the document received by the gateway device 5. The server device 7 includes a document request receiving section 71, a document transmitting section 72, and a document storage section 73.

The document request receiving unit 71 receives the document acquisition request message from the document request receiving unit 51 of the gateway device 5, extracts the document identifier from the document acquisition request message, and converts the document acquisition request with the document identifier into a document. The transmitting unit 72 is notified.

In response to the document acquisition request accompanied by the document identifier notified from the document request receiving unit 71, the document transmitting unit 72 reads out the document data corresponding to the document identifier from the document storage unit 73. The document transmitting unit 72 creates a document data transfer message including the set of the document identifier and the read document data, and transmits the document data transfer message to the gateway device 5 via the network 6. .

The document storage unit 73 is a storage unit of a document similarly to the above-described document storage unit 24, and stores a set of a document identifier of a document and document data. The server device 7 is assumed to be a server device configured with existing technology, and may be, for example, an existing personal computer or workstation device. Further, the server device 7 includes a document request receiving unit 71 and a document transmitting unit 72, a TCP / IP (Transmission control Protocol I Internet Protocol) protocol control unit and an HTTP (Hyper-Text Transfer Protocol). A server device realized using a protocol control unit may be used.

The network 4 and the network 6 are communication networks for providing a data communication service, and may be configured by different technologies. Further, the mobile terminal 1 and the gateway device 5 may be connected to each other, and the gateway device 5 and the server device 7 may be connected to each other using different communication technologies. For example, the network 4 may be a mobile communication network, and the network 6 may be an Internet. In this case, the mobile terminal 1 and the gateway device 5 use a communication technology (for example, a group of WAP protocols) optimized for a mobile communication network, and the gateway device 5 and the server device 7 use a TCPZIP protocol. Groups may be used.

Next, the operation of the communication system according to the second exemplary embodiment of the present invention will be described with reference to FIG. 4 in addition to FIG. 8 and FIG. It is assumed that the document holding unit 15 of the mobile terminal 1 does not store any document data of the deck D including the cards C1 to C7.

When the user instructs the terminal device 1 to acquire the deck D (sequence Y1), the terminal device 1 operates in the same manner as the terminal device 1 of the first embodiment described above. That is, the mobile terminal 1 transmits a document acquisition request message including the document identifier of the deck D from the document request transmission unit 13 to the gateway device 5 via the network 4 (sequence Y 2).

Upon receiving the document acquisition request message, the document request receiving section 51 of the gateway device 5 extracts the document identifier of the deck D from the document acquisition request message, and sends a document acquisition request accompanied by the document identifier to the next document discriminating section 5 2 And sends the document acquisition request message to the server device 7 via the network 6 (sequence # 3). At this time, the next document discriminating unit 52 stores the document identifier of the notified deck D.

The document request receiving section 71 of the server device 7 transmits the document request receiving section 51 When the received document acquisition request message is received, a document identifier (document identifier of Deck D) included in the document acquisition request message is extracted, and a document acquisition request accompanied by the document identifier is notified to the document transmission unit 72.

The document transmitting unit 72 reads the entire document data including the cards C1 to C7 from the document storage unit 73 since the notified document identifier is the document identifier of the deck D, and A document data transfer message including a set of the document identifier of D and the document data of the entire deck D is created, and the document data transfer message is transmitted to the gateway device 5 via the network 6 (sequence Y Four ).

Upon receiving the document data transfer message transmitted from the document transmitting unit 72, the next document determination unit 52 of the gateway device 5 extracts a set of a document identifier and document data from the document data transfer message. Stored in document holder 5 4. When the next document discriminating unit 52 recognizes that the document corresponding to the stored document identifier is not a card but a deck, the next document to be displayed first is determined based on the document data of the deck D. Identify. In this case, the first document displayed is card C1. Then, the next document discriminating unit 52 discriminates the document identifiers of all documents corresponding to the next document of the card C1 based on the contents of the document data of the card C1. In this case, card C 2 and card C 3 are the next documents after card C 1. The next document discriminating unit 52 notifies the document transmitting unit 53 of the card C1 displayed first, the force C2 corresponding to the next document, and the document identifier of the card C3.

When the document identifiers of the cards C1, C2, and C3 are notified from the next document determination unit 52, the document transmission unit 53 transmits the document data corresponding to the notified document identifiers from the document storage unit 54. Read out, create a document data transfer message including the document identifiers of the cards C1, C2, and C3 and the document data sets corresponding to these document identifiers, and send the document data transfer message via the network 4. To the mobile terminal 1 (sequence Y5).

The document receiving section 14 of the mobile terminal 1 receives the document data transfer message transmitted from the document transmitting section 53. Thereafter, the mobile terminal 1 operates in the same manner as the operation of the mobile terminal 1 of the first embodiment described above. That is, the set of the document identifiers and the document data of the cards C1, C2, and C3 included in the document data transfer message is stored in the document holding unit 15. And the force C 1 is displayed on the display device of the portable terminal 1 (sequence Y 6). Here, it is assumed that the user browses the display of the force C1 and presses the button 1 (sequence No. 7). At this time, the selection unit 11 notifies the document display unit 12 of the occurrence of the event of pressing the button 1. Upon receiving the notification of the event occurrence from the selection unit 11, the document display unit 12 identifies the next document as the card C2, reads out the document data of the card C2 from the document storage unit 15, and displays the data on the display device. (Same as above, sequence Υ 8). At the same time, the document display unit 12 notifies the document request transmission unit 13 of a next document acquisition request accompanied by the document identifier of the card C2. The document request transmission unit 13 transmits a next document acquisition request message including the document identifier of the card C2 to the gateway device 5 via the network 4 (sequence # 9).

When receiving the next document acquisition request message transmitted from the document request transmission unit 13, the document request receiving unit 51 of the gate X device 5 receives the document identifier (card C 2) included in the next document acquisition request message. Then, a next document acquisition request accompanied by the document identifier is notified to the next document determination unit 52.

When the next document acquisition request is notified, the next document determination unit 52 reads out the document data corresponding to the notified document identifier of the card C2 from the document holding unit 54, and the content of the document data of the card C2. Then, it is determined that the documents following force C2 are force C4 and C5 based on the information. Then, the next document determination unit 52 notifies the document transmission unit 53 of the determined document identifiers of the cards C4 and C5.

When the document identifiers of the cards C4 and C5 are notified from the next document discriminating unit 52, the document transmitting unit 53 stores the document data (next document data) corresponding to the notified document identifiers into the document holding unit 54. Read from Then, the document transmitting unit 53 creates a document data transfer message including the set of the document identifiers of the cards C 4 and C 5 and the document data, and sends the document data transfer message to the mobile terminal 1 via the network 4. Send (sequence Y 10).

Upon receiving the document data transfer message, the portable terminal 1 stores a set of the document identifiers of the cards C4 and C5 and the document data included in the document data transfer message in the document holding unit 15. Thereafter, the operations of the sequences Yl1 to Y14 are the same as those of the sequences X9 to X12 in FIG. However However, in the communication system according to the second embodiment, the mobile terminal 1 communicates with the gateway device 5 instead of the server device 7.

FIG. 10 is a flowchart showing an outline of the operation of the communication system according to the second embodiment. Referring to FIG. 10, first, the portable terminal 1 transmits a deck D acquisition request to the gateway device 5 (S11). Next, the gateway device 5 transmits a deck D acquisition request to the server device 7 (S12). Next, the server device 7 transmits all the cards C1 to C7 in the deck D to the gateway device 5 (S13). Next, the gateway device 5 transmits the cards C1, C2, and C3 in the deck D to the portable terminal 1 (S14). Next, the card C2 is selected next to the card C1 in the portable terminal 1 (S15). Next, the mobile terminal 1 transmits a next document acquisition request message including the document identifier of the card C2 to the gateway device 5 (S16). Next, the gateway device 5 determines the keys C4 and C5 as the next documents of the card C2 (S17). Next, the gateway device 5 transmits the forces C4 and C5 to the portable terminal 1 (S18). As described above, by interposing the gateway device 5 between the mobile terminal 1 and the server device 7, a server device configured by an existing technology can be used as the server device 7. Therefore, the communication system according to the second embodiment is lower in cost than the communication system according to the first embodiment.

In the communication system according to the second embodiment, when a display request for a document in which no next document exists does not occur (the above description corresponds to a display request for card C5), processing is performed in the same manner as when a next document exists. The document display unit 12 of the mobile terminal 1 checks whether there is a next document, and if the next document does not exist, the document display transmitting unit 13 does not request the next document acquisition. Good. Alternatively, if the next document determining unit 52 of the gate I 5 determines that the next document is not defined in the requested document, the document transmitting unit 53 is not notified. Is also good. In this case, it is possible to reduce the number of transmission messages transmitted between the mobile terminal 1 and the gateway 5 and the amount of transmission data.

Further, in the communication system according to the second embodiment, the next document discriminating unit 52 notifies the document transmitting unit 53 of the document identifiers of all the next documents. However, the number of document identifiers to be notified is limited, and Maximum data size in the document identifier to limit the amount of document data May be added. In this case, a past next document selection history may be used to limit the number of document identifiers or the maximum data size.

Further, the communication system according to the second embodiment includes a plurality of mobile terminals, a plurality of gateway devices, and a plurality of server devices, although the mobile terminal 1, the gateway device 5, and the server device 7 are each one. May be included. In this case, a unique identifier or address is assigned to each of the plurality of form terminals, the plurality of gateway devices, and the plurality of server devices, and each mobile terminal uses a specific gateway device. Alternatively, an association is made so that each document passes through a particular gateway device. The unique identifier or address assigned to each of the mobile terminal, the gateway device, and the server device is used to identify the source and destination of each message.

Next, a communication system according to a third embodiment of the present invention will be described with reference to FIG. 11 and FIG. FIG. 11 is a configuration diagram of a communication system according to the third embodiment, and FIG. 12 is a sequence diagram for explaining an operation of the communication system according to the third embodiment. As shown in FIG. 11, the communication system according to the third embodiment of the present invention is different from the communication system according to the first embodiment as follows. That is, the mobile terminal 1 includes the next document determination unit 16. The next document determination unit 16 receives a document acquisition request from the document display unit 12 and a notification of the next document acquisition request. Further, the document request receiving section 21 of the server device 2 is connected to the document transmitting section 23. When receiving the next document acquisition request message, the document request reception unit 21 notifies the document transmission unit 23 of the document identifier extracted from the next document acquisition request message.

When receiving a document acquisition request with a document identifier from the document display unit 12, the next document determination unit 16 notifies the document request transmission unit 13 of the document acquisition request with the document identifier as it is. When the next document determination unit 16 is notified of the next document acquisition request accompanied by the document identifier from the document display unit 12, the next document determination unit 16 reads the document data corresponding to the document identifier from the document holding unit 15, and reads the document data. From the data, all the documents corresponding to the next document identifier are determined, and a next document acquisition request accompanied by the document identifiers of all the determined documents is notified to the document request transmission unit 13. Next, the operation of the communication system according to the third embodiment of the present invention will be described with reference to FIG. 4 in addition to FIGS. 11 and 12. It is assumed that the document holding unit 15 of the mobile terminal 1 does not store any document data of the cards C1 to C7.

When the user instructs acquisition of Deck D (sequence Z1), the selection unit 11 notifies the document display unit 12 of the occurrence of the event. Based on the meaning of the event and the content of the currently displayed document, the document display unit 12 recognizes that the instruction to acquire the deck D has been received, and transmits the document identifier of the deck D and the document acquisition request to the next document determination unit. Notify 16 The next document determination unit 16 notifies the document request transmission unit 13 of the notified document acquisition request as it is.

The document request transmission unit 13 creates a document acquisition request message including the notified document identifier of the deck D, and transmits the document acquisition request message to the server device 2 via the network 3 (sequence Z 2) .

Upon receiving the document acquisition request message, the server device 2 receives the document identifiers of the cards C1, C2, and C3 from the document transmission unit 23 and the corresponding devices in the same manner as the server device of the first embodiment. A document data transfer message including a set of document data to be transmitted is transmitted to the mobile terminal 1 via the network 3 (sequence Z 3).

Upon receiving the document data transfer message, the mobile terminal 1 receives the document identifiers of the cards C1, C2, and C3 included in the document data transfer message and the same as the mobile terminal 1 of the first embodiment. The corresponding document data set is stored in the document holding unit 15, and the card C1 is displayed on the display device of the portable terminal 1 (sequence Z4).

Here, as in the operation of the first embodiment described above, it is assumed that the user browses the displayed force C1 and presses the button 1 (sequence Z5). At this time, the selection unit 11 notifies the notification document display unit 12 of the event of pressing the button 1. Upon receiving the notification that the button 1 press event has occurred, the document display unit 12 identifies that the next document is the card C 2, reads the document data of the card C 2 from the document holding unit 15, and sends it to the display device. Display (sequence Z6). Further, the document display section 12 notifies the next document determination section 16 of a next document acquisition request accompanied by the document identifier of the card C2.

When the next document acquisition request is notified, the next document discriminator 16 receives the notified card. The document data corresponding to C2 is read from the document holding unit 15. Then, the next document discriminating section 16 discriminates that the next document of the card C2 is the force C4 and C5 based on the content of the read document data, and the document of the card C4 and C5. The next document acquisition request with the identifier is notified to the document request transmission unit 13.

As in the first embodiment, the document request transmission unit 13 transmits a next document acquisition request message including the document identifiers of the cards C4 and C5 to the server device 2 via the network 3 (sequence Z 7).

Upon receiving the next document data transfer message, the document request receiving section 21 of the server device 2 extracts the document identifiers of the cards C 4 and C 5 included in the next document data transfer message, and reads the card C 4 And the document identifier of C5 to the document transmitting unit 23. As in the first embodiment, the document transmission section 23 sends a document transfer message including a set of the document identifiers of the cards C4 and C5 and the corresponding document data (next document data). The data is transmitted to the mobile terminal 1 via the network 3 (sequence Z8).

Upon receiving the document data transfer message, the portable terminal 1 stores a set of the document identifiers of the cards C4 and C5 and the document data included in the document data transfer message in the document holding unit 15. The operations of the sequences Z9 and Z10 are the same as those of the sequences X9 and X10 in FIG.

FIG. 13 is a flowchart showing an outline of the operation of the communication system according to the third embodiment. Referring to FIG. 13, first, the mobile terminal 1 transmits a deck D acquisition request to the server device 2 (S 21). Next, the server device 2 transmits the forces C1, S2, and C3 in the deck D to the portable terminal 1 (S22). Next, the card C2 is selected next to the card C1 in the portable terminal 1 (S23). Next, the cards C4 and C5 are determined as documents following the card C2 in the portable terminal 1 (S24). Next, the portable terminal 1 transmits a next document acquisition request message including the document identifiers of the cards C4 and C5 to the server device 2 (S25). Next, the server device 2 transmits the cards C4 and C5 to the portable terminal 1 (S26).

As described above, by providing the next document determination unit 16 in the portable terminal, the transfer amount of the document data can be reduced as compared with the communication system of the first embodiment. In the embodiment of the present invention, when a display request for a document in which the next document does not exist (the above description In this case, the processing is performed in the same manner as when the next document exists. However, the document display unit 12 or the next document discriminating unit 16 of the portable terminal 1 is processed by the next document. It is also possible to check the presence or absence of the next document and, if the next document does not exist, not to make the next document acquisition request to the document request transmission unit 13. Alternatively, if the next document determination unit 22 of the server device 2 detects that the next document acquisition request does not include the next document, it does not notify the document transmission unit 23 of anything. Is also good. In this case, the number of transmission messages transmitted between the mobile terminal 1 and the server device 2 and the amount of transmission data can be further reduced.

Further, in the third embodiment, all the document identifiers of the next document determined by the next document determination unit 16 are notified to the document request transmission unit 13, but the number of document identifiers is limited. Information indicating the document size may be added to each document identifier. When the number of document identifiers is limited, the next document identifier may be selected based on the statistical information of the past next document selection history.

In the communication system according to the third embodiment, the mobile terminal 1 and the server device 2 are each one, but may have a plurality of mobile terminals and a plurality of server devices. In this case, by assigning a unique identifier or address to each of the plurality of mobile terminals and the plurality of server devices, the source and destination of a message transferred between the mobile terminal and the server device can be specified. .

Next, a fourth embodiment of the present invention will be described. The fourth embodiment relates to a recording medium on which a control program of a communication method for downloading structured document data is recorded. FIG. 14 is a diagram showing a configuration of an example of a recording medium driving device. Referring to FIG. 14, the recording medium drive includes a CPU (Central Processing Unit) 81, a storage unit 82, and an input unit 83. The CPU 81 controls the mobile terminal 1, the gateway device 5, and the server devices 2 and 7 of the communication system described above.

A program for causing the CPU 81 to execute the communication method shown in the above-described flowchart (FIGS. 7, 10 and 13) is recorded in the recording medium 84 in advance. This recording medium 84 can be composed of, for example, a semiconductor memory, an optical disk, a magneto-optical disk, or a magnetic recording medium. Next, the operation of the recording medium driving device will be described. First, when a program read instruction is input from the input unit 83 to the CPU 81, the CPU 81 reads a program from the recording medium 84 and writes the read program into the storage unit 82. Next, when a program start command is input to the CPU 81 from the input unit 83, the CPU 81 reads the program from the storage unit 82, and according to the program, the mobile terminal 1, the gateway device 5, the server device 2, Control 7 The details of the control are as shown in the flowchart (Fig. 7, Fig. 10 or Fig. 13). More specifically, the mobile terminal 1, the gateway device 5, and the server devices 2 and 7 are controlled as shown in a sequence diagram (FIG. 6, FIG. 9, or FIG. 12).

According to the present invention, in a communication system for downloading a structured document stored in a server device via a network in a terminal device, the communication system is provided next to a document already acquired in the terminal device. Since it includes the next document transmission means for transmitting the document associated as the first document from the server device to the terminal device, it is possible to prevent unnecessary consumption of the network bandwidth.

Further, according to the present invention, in a communication method for downloading a structured document stored in a server device via a network in a terminal device, the method includes a method of downloading a document already acquired in the terminal device. Since this includes a next document transmission step of transmitting a document associated as the next document from the server device to the terminal device, it is possible to prevent the network bandwidth from being wasted.

Further, according to the present invention, in a recording medium recording a control program of a communication method for acquiring a structured document stored in a server device via a network in a terminal device, the recording medium includes the terminal device. Since a control program including a next document transmission step of transmitting a document associated with a document next to a document already acquired by the device from the server device to the terminal device is recorded, network bandwidth is wasted. Consumption can be prevented.

More specifically, a first effect of the present invention is that network bandwidth can be used more efficiently than existing technologies, while maintaining a high speed of response from a user's document display instruction to a document display. . The reason is that only the document specified by the user's document instruction and the document following the document are transmitted. A second effect of the present invention is that it is not necessary to store document data of all structured documents in a document storage unit of a terminal. As a result, the required memory of the terminal can be reduced. The reason is that the terminal stores only the display document in the structured document and the document data of the document following the display document in the memory.

A third effect of the present invention is that, by introducing a gateway device, a device configured with an existing technology can be used as a server device. As a result, the cost for carrying out the present invention can be reduced. The reason is that there is no need to manufacture a dedicated server device when implementing the present invention. In addition, even when a new server device is introduced, the server device can not only function as the server device of the present invention but also be used as a server device of a system configured with existing technologies, thereby increasing investment. This is because the effect can be expected.

A fourth effect of the present invention is that, by introducing a gateway device, a server device already operated by existing technology can be used as the server device of the present invention. As a result, the cost for implementing the present invention can be reduced. The reason for this is that there are already many server devices that can function as server devices, and the introduction cost can be reduced accordingly. Also, from the standpoint of the owner of the server device configured with the existing technology, the server device functions as the server device of the present invention without any change.

Claims

The scope of the claims

1. A server device that stores a structured document composed of a plurality of unit documents associated with each other, and a terminal device connected to the server device via a network, wherein the terminal device is connected to the network. A communication system that downloads at least one of the unit documents from the server device via

A second unit document associated as a next unit document with a first unit document included in the structured document already acquired by the terminal device is transmitted from the server device to the terminal device. A communication system characterized by including a next document transmitting means for transmitting.

2. The next document transmission means:

Document notification means provided in the terminal device, for notifying the server device of a document identifier assigned to the first unit document;

A next document discriminating means provided in the server device for discriminating the second unit document using the document identifier notified from the document notifying means;

And a document transmission unit connected to the next document determination unit in the server device and transmitting the second unit document determined by the next document determination unit to the terminal device. The communication system according to 1.

3. The network includes two networks, the communication system further includes a relay device that connects the two networks to each other, and the next document transmission unit includes:

A document notification unit provided in the terminal device, for notifying the relay device of a document identifier assigned to the first unit document;

A structured document transmission unit provided in the server device, for transmitting the structured document to the relay device;

A next document discriminating unit provided in the relay device, for discriminating the second unit document using the document identifier notified from the terminal device;

Connected to the next document discriminating means in the relay device, and discriminated by the next document discriminating means. Document transmission means for transmitting the generated second unit document to the terminal device,

The structured document communication system according to claim 1, further comprising:

4. The next document transmission means,

A next document discriminator provided in the terminal device for discriminating the second unit document; and the second unit connected to the next document discriminator in the terminal device and discriminated by the next document discriminator. Next document requesting means for requesting the server device to transmit a document,

A document transmission unit provided in the server device, for transmitting the second unit document to the terminal device in response to a request from the next document request unit;

5. A terminal device for downloading, via a network, at least one of a plurality of unit documents associated with each other that constitutes a structured document stored in a server device,

The first unit document associated with the first unit document included in the structured document that has already been acquired as the next unit document is transmitted to the server device. A terminal notifying unit for notifying the server of a document identifier assigned to the unit document.

6. A server device for storing a structured document including a plurality of unit documents associated with each other, and providing at least one of the plurality of unit documents to a terminal device via a network,

Upon receiving a notification of the document identifier assigned to the first unit document included in the structured document already obtained from the terminal device, associating the first unit document with the first unit document as a next unit document A server device including document transmitting means for transmitting the obtained second unit document to the terminal device.

7. Download at least one of a plurality of unit documents associated with each other that constitute a structured document stored in a server device via two networks connected to each other by a relay device. A terminal device for transmitting the structured document from the server device to the relay device in advance, and causing the relay device to store the structured document. In order to cause the relay device to transmit a second unit document associated with a first unit document included in the already obtained structured document as a next unit document, the first unit A terminal device, comprising: a document notifying unit that notifies a document identifier assigned to a document to the relay device.

8. Used in a communication system in which a terminal device downloads, via two networks, at least one of a plurality of unit documents associated with each other that constitute a structured document stored in a server device. A relay device for connecting the two networks to each other,

Document holding means for storing the structured document sent from the server device;

When receiving the document identifier assigned to the first unit document included in the structured document that has already been obtained from the terminal device, the first unit document as the next unit document Document transmitting means for transmitting the associated second unit document to the terminal device;

A relay device comprising:

9. Record a plurality of unit documents associated with each other that constitute a structured document, and store at least one of the plurality of unit documents in a terminal via two networks connected to each other by a relay device. In the server device that supplies the device,

When receiving a notification of the document identifier given to the first unit document included in the structured document already acquired from the terminal device, the first unit document as the next unit document Structured document transfer means for transmitting the structured document to the relay device for the purpose of transmitting the associated second unit document from the relay device to the terminal device. Server device.

10. A terminal device for down-linking, via a network, at least one of a plurality of unit documents associated with each other that constitute a structured document stored in a server device.

The second unit document associated with the first unit document included in the already obtained structured document as the next unit document is transmitted to the server device. Determining means for determining the unit document of And a document requesting means for requesting the server device to transmit the second unit document.

11. A server device for storing a structured document including a plurality of unit documents associated with each other and supplying at least one of the plurality of unit documents to a terminal device via a network,

In response to a request for transmission of a second unit document associated with a first unit document included in the structured document already acquired from the terminal device as a next unit document, the second unit document A server device including document transmitting means for transmitting a unit document to the terminal device.

1 2. In a communication method for a terminal device to download a structured document including a plurality of unit documents associated with each other stored in a server device via a network,

A second unit document associated with a first unit document included in the structured document already acquired by the terminal device as a next unit document is transmitted from the server device to the terminal device. A communication method including a next document transmission step.

1 3. The next document transmission step includes:

A document notification step of notifying the server device of the document identifier assigned to the first unit document from the terminal device;

A next document determining step of determining the second unit document using the document identifier in the server device;

A document transmission step of transmitting the second unit document determined in the next document determination step from the server device to the terminal device;

13. The communication method according to claim 12, comprising:

1 4. The network is composed of two networks connected to each other by a relay device,

The next document transmitting step includes:

A document notification step of notifying the document identifier assigned to the first unit document from the terminal device to the relay device; A structured document transmitting step of transmitting the structured document from the server device to the relay device;

A next document determining step of determining the second unit document by using the document identifier notified from the terminal device at the relay device;

A document transmission step of transmitting the second unit document determined in the next document determination step from the relay device to the terminal device;

13. The communication method according to claim 12, comprising:

1 5. The next document sending step includes:

A next document determination step of determining the second unit document in the terminal device; and the terminal device transmits the transmission of the second unit document determined in the next document determination step to the server device. Request next document request step;

A document transmission step of transmitting the second unit document requested in the next document request step from the server device to the terminal device;

13. The communication method according to claim 12, comprising:

1 6. A communication method for a terminal device which downloads, via a network, at least one of a plurality of unit documents associated with each other that constitutes a structured document stored in a server device.

The first unit for the purpose of causing the server device to transmit a second unit document associated with the first unit document included in the structured document already acquired as a next unit document, to the server device. A communication method for a terminal device, comprising a document notification step of notifying the server device of a document identifier assigned to a document.

1 7. A communication method of a server device for storing a structured document including a plurality of unit documents associated with each other and supplying at least one of the plurality of unit documents to a terminal device via a network At

In response to the notification of the document identifier assigned to the first unit document included in the structured document already acquired from the terminal device, the first unit document is associated as the next simple document. A document transmission step of transmitting a second unit document to the terminal device.

1 8. Associations that constitute structured documents stored in the server device In the communication method of the terminal device for downloading at least one of the plurality of unit documents obtained through the two networks connected to each other by the relay device,

Storing the structured document transmitted from the server device in the relay device;

For the purpose of causing the relay device to transmit a second unit document associated with a first unit document included in the structured document already acquired by the terminal device as a next unit document, A communication method for a terminal device, comprising: a document notification step of notifying a document identifier given to a first unit document to the relay device.

1 9. Use at least one of a plurality of unit documents related to each other that constitute a structured document stored in a server device in a communication system in which a terminal device downloads the document via two networks. A communication method of a relay device that connects the two networks to each other,

A document holding step for storing the structured document sent from the server device;

Upon receiving a notification of the document identifier assigned to the first unit document included in the structured document already obtained from the terminal device, associating the first unit document with the first unit document as a next unit document And a document transmission step of transmitting the second unit document to the terminal device.

20. A plurality of unit documents associated with each other that constitute a structured document are stored, and at least one of the plurality of unit documents is stored in a terminal via two networks connected to each other by a relay device. In a communication method of a server device for supplying to a device, when a notification of a document identifier given to a first unit document included in the structured document already acquired from the terminal device is received, A structure for transmitting the structured document to the relay device for the purpose of transmitting the second unit document associated with the first unit document as the next unit document from the relay device to the terminal device. A communication method for a server device, comprising:

2 1. Download at least one of a plurality of unit documents related to each other that constitutes a structured document stored in the server device via a network. In a communication method of a terminal device for

The second unit document associated with the first unit document included in the already obtained structured document as the next unit document is transmitted to the server device. And a document requesting step for requesting the server device to transmit the second unit document determined in the determining step. .

2 2. A communication method of a server device for storing a structured document composed of a plurality of unit documents associated with each other and supplying at least one of the plurality of unit documents to a terminal device via a network. At

In response to a request for transmission of a second unit document associated with a first unit document included in the structured document already acquired from the terminal device as a next unit document, the second unit document A communication method for a server device, comprising a document transmitting step of transmitting a unit document to the terminal device.

2 3. On a recording medium on which a communication control program is recorded for a terminal device to download a structured document composed of a plurality of unit documents associated with each other stored in a server device via a network. ,

The communication control program transmits, from the server device, a second unit document associated with a first unit document included in the structured document already acquired by the terminal device as a next document. A recording medium on which a communication control program is recorded, including a next document transmission step of transmitting to a terminal device.

2 4. The next document transmission step includes:

24. The recording medium according to claim 23, further comprising: a document transmitting step of transmitting said second unit document determined in said next document determining step from said server device to said terminal device.

2 5. Two networks where the network is connected to each other by a relay device It is composed of

The next document transmitting step includes:

A document notification step of notifying the document identifier assigned to the first unit document from the terminal device to the relay device;

A structured document transmission step of transmitting the structured document from a server device to the relay device;

A next document discriminating step of discriminating the second unit document by using the document identifier notified from the terminal device in the relay device;

23. The recording medium according to claim 23, comprising:

2 6. The next document sending step includes:

A next document discriminating step of discriminating the second unit document in the terminal device; and the terminal device requesting the previous server device to transmit the second unit document discriminated in the next document discriminating step. Next document request step to do

A document transmitting step of transmitting the second unit document requested in the next document requesting step from the server device to the terminal device;

23. The recording medium according to claim 23, comprising:

2 7. A communication control program for a terminal device that downloads, via a network, at least one of a plurality of unit documents associated with each other that constitutes a structured document stored in a server device. Is recorded on a recording medium,

The communication control program is configured to cause the server device to transmit a second unit document associated with a first unit document included in the acquired structured document as a next unit document, A recording medium, comprising: a document notification step of notifying the server device of a document identifier assigned to the first unit document.

2 8. A communication control program for a server device that stores a structured document including a plurality of unit documents associated with each other, and supplies at least one of the plurality of unit documents to a terminal device via a network. In a recording medium on which The communication control program responds to the notification of the document identifier assigned to the first unit document included in the structured document already acquired from the terminal device, and A recording medium comprising a document transmitting step of transmitting a second unit document associated as a next unit document to the terminal device.

2 9. Download at least one of a plurality of linked unit documents that constitute a structured document stored in the server device via two networks connected to each other by a relay device Recording medium storing the communication control program of the terminal device for

The communication control program,

For the purpose of causing the relay device to transmit a second unit document associated with a first unit document included in the structured document already acquired by the terminal device as a next unit document, A recording medium, comprising: a document notification step of notifying the relay device of a document identifier assigned to a first unit document.

30. Communication in which a terminal device downloads at least one of a plurality of unit documents related to each other that constitute a structured document stored in a server device via two networks. A recording medium used in a system, in which a communication control program of a relay device that connects the two networks to each other is recorded, wherein the communication control program is

Upon receiving a notification of the document identifier assigned to the first unit document included in the structured document already obtained from the terminal device, associating the first unit document with the first unit document as a next unit document Transmitting a second unit document to the terminal device.

3 1. A plurality of unit documents associated with each other that constitute a structured document are stored, and at least one of the plurality of unit documents is connected to each other by a relay device. In a recording medium storing a communication control program of a server device to be supplied to a terminal device through two networks,

When the communication control program receives a notification of a document identifier given to a first unit document included in the structured document already acquired from the terminal device, the first unit document A structured document transfer step of transmitting the structured document to the relay device for the purpose of causing the relay device to transmit a second unit document associated as the next unit document to the terminal device. A recording medium characterized by including.

3 2. A communication control program for a terminal device for down-loading at least one of a plurality of unit documents associated with each other constituting a structured sentence stored in a server device via a network. In the recording medium in which is recorded, the communication control program, the second unit document associated with the first unit document included in the already obtained structured document as the next unit document, A discriminating step of discriminating the second unit document for the purpose of transmitting to the server device; and a document requesting step of requesting the server device to transmit the second unit document discriminated in the discriminating step. A recording medium comprising:

3 3. Communication control of a server device for storing a structured document including a plurality of unit documents associated with each other and supplying at least one of the plurality of unit documents to a terminal device via a network. In a recording medium on which a program is recorded, the communication control program is associated as a next unit document with a first unit document included in the structured document already acquired from the terminal device. A recording medium, comprising: a document transmission step of transmitting the second unit document to the terminal device in response to a transmission request of the second unit document.