JPH1125010A - Data converter, its management method, network system having data converter, and recording medium recording data conversion program - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide data converters, etc., capable of evading the overlapped execution of data conversions even when plural data converters exist between a data storaging server and a client terminal. SOLUTION: When a conversion instruction command, e.g. 'small', is included in a received message, a data converter 13-2 separates the command, shapes the form of the message and outputs the message. The message is inputted to a data storing server 11-1 through a data repeater 14 and a data converter 13-1. The server 11-1 outputs still picture data as a response message to the received message. A data converter 10-1 recognizes that the converter itself is a data converter nearest to the server 11-1 from the passage route information of the received message and executes prescribed conversion processing.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a data storage server for storing various data and a plurality of data conversion apparatuses installed in a network having client terminals for displaying the data of the data storage server. The present invention relates to a data conversion device that handles multimedia data such as screen configuration information, images, and audio data.

[0002]

2. Description of the Related Art For example, as described in Japanese Patent Application No. 7-118873, multimedia data (a display screen having a display screen) is transmitted from a data storage server to a client terminal. Information, images, audio data, etc.), the data amount is controlled in accordance with the request of the user of the client terminal. Less than,
This type of data converter will be described.

First, a case where a data conversion device does not exist in a network will be described. FIG. 4 shows an example of a screen displayed on the client terminal. This screen is displayed based on certain screen configuration information sent from the data storage server to the client terminal. 40 is a client display screen, 41 and 46 are still images, 42, 44 and 48 are text, and 43, 45 and 47 are buttons for referring to other data. In the example of FIG. 4, when the user of the client terminal selects the button 47, a still image 51 as shown in FIG. 5 is displayed.

[0004] Next, consider the case where one data conversion device exists in the network. In this case, the above-described screen configuration information output from the data storage server is converted by the data conversion device, and the converted screen configuration information is sent to the client terminal. FIG. 7 shows a screen displayed based on the screen configuration information after conversion. 42 to 45, 47, and 48 are the same as those in FIG. 70 is a client display screen, 71
4 is a reduced image of the still image 41 in FIG. 4, 73 is a button for referencing moving image data converted by the data conversion device referred to by the button 43 in FIG. 4, and 75 is referenced by the button 45 in FIG. Button for referring to the converted audio data by the data converter, 76 is a reduced image of the still image 46 in FIG. 4, 77 is the still image data referred to by the button 47 in FIG. This is a button for referring to what has been done. In this example, when the user of the client terminal selects the button 77 in FIG. 7, a reduced image 81 of the still image 51 (see FIG. 5) is displayed as shown in FIG.

[0005] By doing so, the amount of data transmitted and received on the network is reduced, and the access time to the data storage server is greatly reduced.

[0006]

However, in the above-mentioned prior art, when a plurality of data converters exist in a network, each of the data converters executes the conversion process. In this case, for example, since a single still image is subjected to a plurality of reduction conversions, there is a problem that the image is reduced more than necessary.

[0007] In view of the above problems, an object of the present invention is to provide a data conversion apparatus which can avoid redundant execution of data conversion processing even if a plurality of data conversion apparatuses exist between a data storage server and a client terminal. It is an object of the present invention to provide a management method, a network system having a data conversion device, and an information storage medium storing a data conversion program.

[0008]

According to one aspect of the present invention, there is provided a network having a data storage server for storing various data and a client terminal for displaying data of the data storage server. In a plurality of data conversion devices installed, each data conversion device,
Storage means, directly or, received from the client terminal, or received via another data conversion device, the message as it is or change the content,
First conversion means for sending to the data storage server or another data conversion device, and a message issued from the data storage server received directly or via another data conversion device, and the message is received as it is or as contents. And a second conversion means for sending the data to the client terminal or another data conversion device, wherein the first conversion means is provided when a predetermined conversion instruction command is included in the received message. And means for storing identification information for specifying a data conversion device to be subjected to data conversion in the storage means, wherein the second conversion means includes a data to be converted included in the received message. Means for determining, using at least two pieces of information, whether the data is data to be converted by the present conversion device;
Means for executing a conversion process of the data when it is determined that the data is data to be converted by the conversion device, wherein the two pieces of information are a message until the data is received by the conversion device. A data conversion device, characterized in that the information is any one of information relating to a passing route of the data and information indicating whether or not the identification information is stored in the storage means, and information indicating a type of the data. Is provided.

[0009]

DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described below with reference to the drawings.

FIG. 1 shows a configuration example of a network system for implementing the present invention. In FIG.
Reference numerals 1 and 10-2 denote client terminals for displaying a screen (hereinafter, referred to as a page) composed of images, texts, and the like, and playing back audio, and 11-1 and 11-2 denote image, text, and screen configurations. Data storage servers 12-1 and 12-2 for storing various data such as information include a network to which client terminals and data storage servers are connected;
Reference numerals 1, 13-2 denote various data transmitted from the data storage server to the client terminal in response to a request from the client terminal, and a data conversion device for controlling the amount of data. This is a data relay device that performs only relay.

FIG. 2 shows the configuration of the data conversion device. The data conversion device includes a display 25 for displaying graphics and the like, a keyboard 26 for receiving a user's input operation.
And a mouse 27, a communication control unit 21, a storage device (for example, a hard disk) 22, a memory 23, and a processor 24. These are connected via an internal bus 28.

The communication control unit 21 receives a message output from the data storage server, the client terminal, the data relay device, or another data conversion device via the network 20 and sends the message to the internal bus 28. The message sent to the internal bus 28 is stored in the memory 2
Then, each process related to this message is executed. The content of the message is changed as needed. For example, when a message transmitted from the data storage server to the client terminal includes data to be converted, the data amount is reduced. As will be described later, this reduction process is not performed by all data converters, but is performed only by a specific data converter.

Thereafter, the above-mentioned message is input to the communication control unit 21 and is transmitted via the network 20 to the data storage server, the client terminal, the data relay device, or
It is transmitted to other data conversion devices. Storage device 22
Stores a program for changing the content of a message (hereinafter, referred to as a data conversion program) and various data required by the data conversion program. Input and output relating to the data conversion program are performed through each device as conceptually shown in FIG. And
The data conversion program 30 is read into the memory and executed by the CPU, thereby realizing first and second conversion units described later. The start and stop of the data conversion program can be operated by the keyboard 26 and the mouse 27. The data conversion program is portable if it is stored in a recording medium such as a floppy disk.

FIG. 4 shows an example of a page displayed on the client terminal. 40 is a display screen of the client terminal,
41 and 46 are still images, 42, 44 and 48 are text,
43, 45, and 47 are buttons for referring to other data. In this example, the button 43 is used for referring to moving image data. The button 45 is used for referencing audio data, and the button 47 is used for referencing still image data.

FIG. 5 shows an example of a page displayed when the user of the client terminal selects the button 47 in FIG. When the button 47 is selected, a still image 51 as shown in the figure is displayed on the display screen 50 of the client terminal.

FIG. 6 shows an example of screen configuration information defining the screen configuration of the client display screen 40 shown in FIG. 60 is screen configuration information, 61 is the still image 41 of FIG.
Is information that defines that the data “Rabbit.jpg” of the above is obtained from the data storage server and displayed on the page. Reference numeral 62 denotes a button 43 “Let's Dance” in FIG. 4 and “Rabit.mpg” when the user of the client terminal selects the button.
Is information that defines that moving image data is acquired from the data storage server and displayed on a page. 63 is
Display the button 45 “HAPPY BIRTHDAY” in FIG.
In addition, the information defines that when the user of the client terminal selects the button, voice data “music.wav” is obtained from the data storage server and output from the client terminal. Reference numeral 64 denotes information that defines that the data “Cake1.jpg” of the still image 46 in FIG. 4 is obtained from the data storage server and displayed on the page. 65 is a button 47 called “square shape” in FIG.
And that the still image data “Cake2.jpg” is obtained from the data storage server and displayed on the page when the user of the client terminal selects the button.

FIG. 7 shows an example of a page displayed on the client terminal when the client display screen 40 shown in FIG. 4 is converted by the data converter. 42-45, 4
7, 48 are the same as FIG. 70 is a client display screen, 71 is a reduced image of the still image 41 in FIG.
Is a button for displaying data obtained when the moving image data referred to by the button 43 in FIG. 4 is converted by the data converter, and 75 is a data conversion unit for converting the audio data referred to by the button 45 in FIG. A button for referring to data obtained when the data is converted by the device, 76 is a reduced image of the still image 46 in FIG. 4, and 77 is a still image data referred to by the button 47 in FIG. A button for referring to data obtained in the case.

FIG. 8 shows an example of a page displayed when the user of the client terminal selects the button 77 in FIG. When the button 77 is selected, a reduced image 81 of the still image 51 (see FIG. 5) is displayed on the client display screen 80 as shown in FIG.

FIG. 9 shows an example of screen configuration information defining the screen configuration of the client display screen 70 shown in FIG. This screen configuration information is created by the data conversion device based on the screen configuration information in FIG. In FIG. 9, 62,
63 and 65 are the same as in FIG. 90 is screen configuration information, and 91 is data “Rabi” of the still image 41 in FIG.
t. "jpg" is information defining that data conversion is to be performed by the data conversion device in accordance with the command "small" for instructing data conversion during the process of obtaining the data from the data storage server, and the conversion result is displayed on a page.
2 displays a button 73 “Still” in FIG. 7 and, when the user of the client terminal selects the button 73, obtains “Rabbit” obtained by selecting the button 43 “Let's Dance” in FIG. .Mp
While obtaining moving image data “g” from the data storage server, a command “st” instructing data conversion
ill ”in accordance with the data conversion device,
This is information that defines that the converted result is displayed on the page. 93 displays a button 75 “Play NOW!” In FIG. 7 and, when the user of the client terminal selects the button, “HAPPY BIRTHD” in FIG.
“Musi” obtained by selecting the button 45 “AY”
c. In the process of obtaining the audio data “wav” from the data storage server, the data defines that the data conversion is performed by the data conversion device in accordance with the command “stream” instructing the data conversion, and the converted result is output by the client terminal. 94 is the still image 46 of FIG.
Command "sm" instructing data conversion while obtaining the data "Cake1.jpg" from the data storage server.
all "in the data conversion device according to the
This is information that defines that the converted result is displayed on the page. 95 is a button 7 "small" in FIG.
7 is displayed, and when the user of the client terminal selects the button, the still image data “Cake2.jpg” obtained by selecting the “square” button 47 in FIG. 7 is obtained from the data storage server. Command “smal” instructing data conversion
The information defines that data is converted by the data conversion device in accordance with “1” and the converted result is displayed on a page.

FIG. 10 shows an example of a data acquisition request message (hereinafter abbreviated as a data acquisition request message) transmitted from the client terminal to the data storage server. 100 is an identifier indicating that this message is a data acquisition request message, 101 is a data address for specifying data to be acquired, and 102 is a header. The header 102 is referred to by the passage route information 103 in which each device through which the message reaches the data storage server is registered, the data type 104 representing the type of data, and the data relay device and the data storage server. It is composed of comment information 105 without. The data address 101 is, for example, the name of a server, a directory in the server, and a file name (Rabit.jpg).
Etc.). In the data type 104, for example,
The type may be represented by using a part of the file name such as “jpg”.

FIG. 11 shows an example of a response message (hereinafter abbreviated to a response message) of a data acquisition request message transmitted from the data storage server to the client terminal. Reference numerals 102 to 105 are the same as those in FIG. However, in the passage route information 103, each device through which this message passes until it reaches the client terminal is registered. Reference numeral 110 denotes a status indicating a processing result of the data acquisition request, and reference numeral 111 denotes content (screen configuration information, still image data, moving image data, audio data, and the like) acquired by the client terminal. The content 111 may not exist depending on the processing result.

FIG. 12 shows a processing flow of the data converter. In this embodiment, S (step) in FIG.
1201 to S1205 are executed by the first conversion means, and S1
Steps 206 to S1211 are executed by the second conversion means. Here, the client terminal side is defined as downstream, and the data storage server side is defined as upstream.

In FIG. 12, in step S1201, initialization processing is performed, and in step S1202, it is determined whether a communication connection has been established in response to a request from a downstream device.
If the communication connection with the downstream device has not been established, it waits until the communication connection is established. S12
02, if a communication connection is established,
Waits for a message from the downstream device. S1203
In step S1204, a communication connection is established with the upstream device.

If establishment of a communication connection with the upstream apparatus fails in S1204, in S1205 S1205
In step S1211, a message indicating the execution failure of the message received in step 3 is created and transmitted to the downstream device.
Then, the established communication connection is disconnected.

If the communication connection with the upstream device is successfully established in S1204, the process proceeds to S1206, where S120
It is determined whether or not the message received in step 3 is a data acquisition request message. If the message is a data acquisition request message, a conversion process is performed on the message in step S1207. To the local device. If it is determined in S1206 that the received message is not a data acquisition request message, in S1208, the message is transmitted to the upstream device as it is.

In S1209, a response message from the data storage server is waited for. If a response message has been received in S1209, conversion processing of the response message is performed in S1210, and the established communication connection is disconnected in S1211.

Although there is no direct relation in this embodiment,
If there is a message other than the response message from the data storage server (for example, a message that is spontaneously issued by the data storage server), S1210 is skipped and the message is sent to the downstream device as it is.

FIG. 13 shows the details of the data acquisition request message conversion process (S1207) of FIG.

In step S1301, the data address (101 in FIG. 10) included in the data acquisition request message is checked, and a command ("small", "still", "str") for instructing data conversion is added to the data address.
It is determined whether or not a command for instructing data conversion (hereinafter, abbreviated as a conversion instruction command) is included in S1302 in FIG.
The conversion position of the data to be acquired by the current data acquisition request message is analyzed with reference to the table shown in FIG.

In the table shown in FIG. 14, the correspondence between the conversion instruction command 1401 and the conversion position 1402 is defined. Here, the conversion instruction command “small” 1
The conversion position 1404 designated by 403 is set to the most upstream data conversion device (that is, the data conversion device closest to the data storage server). Also, the conversion position 1406 specified by the conversion instruction command “stream” 1405
Is set as the most downstream data conversion device (that is, the data conversion device closest to the client terminal), and the conversion position 14 indicated by the conversion instruction command “still” 1407 is
08 is set in the most upstream data converter. In the present embodiment, the table in FIG. 14 is set in advance in each data conversion device with the same contents. However, even if the contents of each table are different for each device, the present data converter operates without any problem. For example,
Regarding the data that is set as “conversion at the lowermost stream” by the lowermost data converter, the conversion at the lowermost stream is always performed regardless of the settings of the other data converters. In the case of a worldwide network such as the Internet, it is almost impossible to arrange the tables of the respective devices to have the same contents. Rather, it is more realistic to think that the contents of the respective tables are different.

Conceptually, a command (for example, “sma
11 ") and a command (for example," stream ") instructing data conversion by the most downstream data converter as one group, and instructing data conversion by the lowermost data converter. Data to be data-converted by the most downstream data conversion device can be grasped as another group.

If it is determined in S1302 that data conversion is to be performed by the most upstream data converter, or
If it is determined in S1301 that the conversion instruction command is not incorporated in the data address (101 in FIG. 10) in the data acquisition request message, in S1304, the passing route information in the data acquisition request message (FIG.
(103 of 0) is checked to determine whether or not the data acquisition request message is a message that has passed through another data conversion device. If this data acquisition request message has passed at least one other data conversion device, S1305
It is determined whether or not a comment (105 in FIG. 10) instructing data conversion exists in the message. If there is no comment instructing data conversion (hereinafter, abbreviated as a conversion instruction comment), in S1310, the present data conversion apparatus is added to the passage route information (103 in FIG. 10) in the data acquisition request message.

If there is a comment instructing data conversion, the data conversion instruction comment is extracted from the message in S1306 and stored in the storage means (the memory 23 in this embodiment) as identification information. For example, when the conversion instruction comment is “small”, “small” may be stored in the memory 23 as identification information. Of course, these are only examples. After that, S1310 is executed.

If it is determined in step S1304 that the received data acquisition request message is a message that has not passed through another data conversion device (that is, the present data acquisition request message is the first data conversion request message). In step S1307, the data address (10 in FIG. 10) in the data acquisition request message is used.
Check 1) to determine whether a conversion instruction command is incorporated in the data address. If the conversion instruction command has not been incorporated, S1310 is executed.

If it is determined in S1307 that the conversion instruction command is incorporated in the data address,
At step 8, the conversion instruction command is separated from the data address and stored in the memory 23. Specifically, the conversion instruction command is deleted from the data address of the data acquisition request message so that the data storage server can recognize the data acquisition request message, and the conversion instruction command is adjusted to a normal data address.
The identification information corresponding to the conversion instruction command is stored in the memory 23.
To be stored. At this time, the conversion instruction command is “smal
If "1", "small" may be stored in the memory 23 as identification information.

When the identification information is stored in the memory 23, S1
At 309, the conversion instruction comment is stored in the data acquisition request message. At this time, if the conversion instruction command is “small”, “small” may be stored in the data acquisition request message as the conversion instruction comment. After that, S1310 is executed.

On the other hand, if it is determined in S1302 that data conversion is not to be performed by the most upstream data conversion device (that is, data conversion is to be performed by the most downstream data conversion device),
In S1303, the same processing as in S1308 is performed. That is, the conversion instruction command is erased from the data address of the data acquisition request message so that the data storage server can recognize the data storage request message, and the data acquisition request message is converted into a normal data address. It is stored in the memory 23. When the conversion instruction command is "s
"mall", the identification information is "smal"
l ″ may be stored in the memory 23. Thereafter, S1310 is executed.

The above is the conversion process of the data acquisition request message. In this process, the type of the conversion instruction command is set so that the most upstream data conversion device and the most downstream data conversion device can be arbitrarily selected. Has become.

However, if the system performs data conversion only with the data conversion device at the most downstream, S130
2. Steps S1304 to 1309 may be omitted. in this case,
If it is determined in step S1301 that a conversion instruction command is included, steps S1303 and S1310 are executed.
If it is determined in step 1 that the conversion instruction command is not included, step S1310 is executed.

If the system performs data conversion only by the most upstream data converter, S1301
1303 may be omitted.

FIG. 15 shows the details of the response message conversion process (S1210) of FIG.

In step S1501, it is determined whether or not the response message is an affirmative response.
0, the passage route information in the response message (10 in FIG. 11)
This data conversion device is added to 3), and the message is transmitted to the downstream device. On the other hand, if the answer is affirmative, S
At 1502, the data type in the response message (FIG. 11)
From 104), the data identifier and the extension included in the data name are extracted. If one of the data identifier and the extension does not exist, the one that exists is used hereafter. If both the data identifier and the extension are included, the data identifier is used.

Next, in S1503, the contents in the response message (FIG.
It is determined whether or not the data of 111) is data to be converted. The table shown in FIG.
1, data identifier 1602, data conversion processing content 16
03, the correspondence between the conversion positions 1604 is defined.
Of course, these are only examples. If it is determined in S1503 that the data to be converted does not exist, S1510
Execute

If it is determined in S1503 that there is data to be converted, it is determined in S1504 whether the data is data to be converted by the most upstream data converter with reference to the table in FIG. If this data is to be converted by the most upstream data converter,
Step S1505 is executed. If not (in other words, this data is data to be converted by the most downstream data converter), step S1509 is executed.

In S1505, the passage route information (103 in FIG. 11) in the response message is checked to determine whether this response message is a message that has passed through another data conversion device. If this response message is a message that has not passed through another data converter, S1
In step 506, the conversion processing corresponding to the data to be converted is selected with reference to the table in FIG. After that, S1507
Then, the selected data conversion process is executed. On the other hand, if the response message is a message that has passed through another data conversion device, the data conversion device is added to the passage route information (103 in FIG. 11) in the response message in S1508, and the message is sent to the downstream side. Send to device.

In step S1509, it is determined whether the identification information is stored in the memory 23. If the identification information has been stored in the memory 23, the process proceeds to S1506.
Then, referring to the table of FIG. 16, a conversion process corresponding to the data to be converted is selected. Thereafter, in S1507, the selected data conversion process is executed. On the other hand, if the identification information has not been stored in the memory 23, S1510 is executed.

The above is the conversion processing of the response message. For example, if the system performs data conversion only by the data conversion apparatus at the most downstream, S1504 and S15
05, S1508 may be omitted. Further, if the system performs data conversion only by the most upstream data conversion device, S1504, S1509, and S1510 may be omitted.

Next, the contents of the table shown in FIG. 16 will be specifically described.

In this table, the extension is “HTML”
1605 or the data identifier is “html” 1606
, “Screen configuration data conversion processing” 1607
Is executed in the “most upstream” 1608, and the extension is “J”.
PEG "1609" or the data identifier is "jpeg"
If it is 1610, “still image reduction processing” 1611
Is executed in the “most upstream” 1612, and the extension is “W
AV ”1613 or the data identifier is“ wav ”16
If it is 14, “audio stream processing” 1615
Is executed at the “downstream” 1616, and the extension is “M”.
PG “1617” or data identifier “mpeg” 1
618, “moving image / still image conversion process” 1619
Is executed in the “most upstream” 1620. In the case of a still image, performing data conversion processing with a data conversion device closer to the data storage server can reduce data traffic on the entire network and shorten data access time. Also, when performing data conversion such that the audio file is divided and transmitted so as to be sequentially reproduced on the client terminal, in order to avoid the influence of the load fluctuation of the network in the middle and avoid the sound interruption in the sequential reproduction on the client terminal, It is better to perform the data conversion process with the data conversion device closest to the client terminal.

Next, the screen configuration data conversion processing, the still image reduction processing, the audio stream conversion processing, and the moving image / still image conversion processing will be described in order.

First, the screen configuration data conversion processing will be described with reference to FIG. In step S1701, an initialization process is performed. As the initialization process, there is a process of obtaining the head position of the screen configuration information of the content (111 in FIG. 11) in the response message and using this as a read position.

In step S1702, the screen configuration information for one line is read from the read position, and then the read position is advanced to the next line. In step S1703, it is determined whether the reading of the screen configuration information has all been completed. Specifically, when it is determined that the screen configuration information cannot be read any more, it is assumed that the reading of the screen configuration information has all been completed. In S1704, it is determined with reference to the table of FIG. 18 whether or not the read information of one line of the screen configuration information (hereinafter, referred to as element information) is a conversion target. In the table of FIG. 18, a conversion target 1801, a method 1802, a conversion instruction command 1803, and a display mode 1804 are defined. These will be described in detail later. If it is determined in step S1704 that the data is to be converted, in step S1705, FIG.
In step S1706, the converted element information is added to the new screen configuration information. If it is determined in S1704 that the element information is not to be converted, the read element information is directly added to the new screen configuration information in S1706 without performing the conversion processing.
After that, the process returns to S1702.

If it is determined in step S1703 that the processing of all data has been completed, in step S1707, the generated new screen configuration information is replaced with the content (11 in FIG. 11) in the response message.
Replace with the screen configuration information of 1). Next, S1708
The pass route information in the response message (10 in FIG. 11)
This data conversion device is added to 3), and the message is transmitted to the downstream device.

In the initialization process 1701, the data conversion device is added to the passage route information (103 in FIG. 11) in the response message, and the status of the response message (110 in FIG. 11) and the header (110 in FIG. 11). 102) may be transmitted to the downstream device first, and in S1708, only the content (111 in FIG. 11) may be transmitted to the downstream device.

In the initialization processing 1701, the present data converter is added to the passage route information (103 in FIG. 11) in the response message, and the status of the response message (110 in FIG. 11) and the header (110 in FIG. 11). 102) may be transmitted to the downstream device first, and in S1706, instead of adding to the new screen configuration information, the element information may be transmitted to the downstream device, and subsequent processing may be omitted.

The table shown in FIG. 18 will be described.
In this example, “<A HREF =” *. jpg ”
If an 805 (hereinafter, “*” indicates the entire character string) exists, the conversion method “insert” 1806 is selected. In this case, the data reference definition in which the conversion instruction command “small” 1807 is inserted after “*” separated by “.” And the display definition of the button “small” 1808 selected when the user refers to the data are described. These data are referred to in the data reference definition “<A HREF =” *. j
pg ". By performing such processing, a definition of 95 is newly inserted after 65 in FIG.

In the read element information, "<IM
If the description 1809 of G SRC = “*. Jpg” exists, the conversion method “conversion” 1810 is selected. In this case, the description 1809 includes the conversion instruction command “smal
l ”1811 is converted to a data reference definition inserted after being separated by“. ”after“ * ”. By performing such processing, the still image reference definition 61 in FIG.
Is converted to

Further, “<A HREF =” *. gif "
In the case of the description 1813, the same processing as 1805 is performed, and “<IMG SRC =” *. In the case of the description 1817 of “gif”, the same processing as 1809 is performed.

[<A HREF = ”*. In the case of the description 1821 of “wav”, the conversion method “insert” 1822 is selected. In this case, the conversion instruction command “stream
m "1823 after" * "and a display definition of a button" Play NOW! "1824 to be selected when the user refers to this data, and a display definition of the button" Play NOW! " , The data reference definition "<
A Insert into the line following HREF = "*. Wav". By performing such processing, a definition 93 is newly inserted after 63 in FIG.

[<A HREF = “*. In the case of the description 1825 of “mpg”, the conversion method “insert” 1826 is selected. In this case, the conversion instruction command “still”
Create a data reference definition inserted with “.” After “*” and a display definition of a button “Still” 1828 to be selected by the user when referring to this data. Reference definition "<A HREF
= Insert the line following “* .mpg”. By performing such processing, a definition 92 is newly inserted after 62 in FIG.

Next, a still image reduction process will be described with reference to FIG.

In step S1901, initialization processing such as reading out still image data of the content (111 in FIG. 11) in the response message is performed. In step S1902, still image data in which the height and width of the read still image is reduced to half is created. In step S1903, the reduced still image data is
Replaced with still image data of the content (111 in FIG. 11). In S1904, the data conversion device is added to the passage route information (103 in FIG. 11) in the response message, and the message is transmitted to the downstream device.

In S1902, a reduced size such as 1/4 length and width may be adopted. Also, initialization processing 1901
At the passage route information (10 in FIG. 11) in the response message.
This data converter is added to 3), and the status (110 in FIG. 11) and the header (10 in FIG. 11) of the response message are added.
2) may be transmitted to the downstream device first, and in S1904, only the content (111 in FIG. 11) may be transmitted to the downstream device. Also, initialization processing 1901
At the passage route information (10 in FIG. 11) in the response message.
This data converter is added to 3), and the status (110 in FIG. 11) and the header (10 in FIG. 11) of the response message are added.
2) may be transmitted to the downstream apparatus first, and in S1902, the data after the reduction processing may be sequentially transmitted while performing the reduction processing of the still image.

Next, the moving image / still image conversion process will be described with reference to FIG.

In step S2001, initialization processing such as obtaining the head position of moving image data of the content (111 in FIG. 11) in the response message is performed. In step S2002, one frame of moving image data is read. In S2003, it is determined whether or not processing of all data has been completed. If processing of all data has not been completed, it is determined in S2004 whether moving image frame conversion for five frames has already been performed. If the conversion for five frames has not been performed, S2
In 005, it is determined whether the read video frame is a multiple multiple of 30 from the beginning. If the read video frame is a multiple multiple of 30th, the video frame is converted to a still image in S2006. Add to the created still image data. After that, the next moving image frame is read in S2008. If it is determined in S2005 that the frame is not a multiple multiple of 30th, S2008 is also executed.

If it is determined in step S2003 that the processing of all data has been completed, or if it is determined in step S2004 that video frame conversion for five frames has already been performed, in step S2009, the still image data generated this time is processed. Is replaced with the moving image data of the content (111 in FIG. 11) in the response message, and the data type (104 in FIG. 11) in the response message is set to still image data. Thereafter, in S2010, the present data conversion device is added to the passage route information (103 in FIG. 11) in the response message, and the message is transmitted to the downstream device.

In S2004, different from five frames, for example, ten frames may be adopted. Also, S2
In 005, a different multiple of 30, for example, a multiple of 20, may be employed.

In the initialization process S2001, the present data converter is added to the passage route information (103 in FIG. 11) in the response message, and the data type (1 in FIG. 11) is added.
04) to still image data, and changes the status of the response message (110 in FIG. 11) and the header (10 in FIG. 11).
2) may be transmitted to the downstream device first, and in S2010, only the content (111 in FIG. 11) may be transmitted to the downstream device.

In the initialization process S2001, the present data conversion apparatus is added to the passage route information (103 in FIG. 11) in the response message, and the data type (1 in FIG. 11).
04) to still image data, and changes the status of the response message (110 in FIG. 11) and the header (10 in FIG. 11).
2) may be transmitted to the downstream device first, and the generated still image data may be sequentially transmitted to the downstream device in S2007.

Next, the audio streaming process will be described with reference to FIG.

In step S2101, the transmission interval (Tp) when audio data is packetized and transmitted, the data amount to be converted into one packet (Dp), the current time (Tn), and the transmission time (Ts) are initialized. Do.

In S2102, the present data conversion apparatus is added to the passage route information (103 in FIG. 11) in the response message, and the status of the response message (110 in FIG. 11).
And the header (102 in FIG. 11) are transmitted to the downstream device first.

In S2103, it is determined whether or not the processing for all the audio data of the content (111 in FIG. 11) in the response message has been completed, and if completed, the processing is terminated. If not completed, the current time information is acquired in S2104 to update the value of Tn, and in S2105, it is determined whether the value of Tn−Ts is equal to or greater than the value of Tp. Tn-Ts value is Tp
If the value is equal to or greater than the value, it is determined that it is the packet transmission time, and the content (FIG.
The data of 1 Dp is read from 111) of 1 and packetized and transmitted. When reading the next data, read it after the transmitted data. In S2107, the transmission time Ts is updated to the value of the current time Tn, and thereafter, the process returns to S2103. If it is determined in step S2105 that the value of Tn-Ts is smaller than the value of Tp, it is determined that the transmission time has not yet been reached, and the current time information acquisition process of step S2104 is performed again.

The above is the configuration and operation of the data converter of the present embodiment. Next, the overall flow of a network system having a plurality of data converters will be described.

First, a sequence when the client terminal requests acquisition of screen configuration information will be described with reference to FIG.

10-1, 11-1, 13-1, 13-
2 and 14 are the same as in FIG. Client terminal 10-
1 establishes a communication connection 2201 with the data conversion device 13-2, and transmits a data acquisition request message 2202 to the data conversion device 13-2 to obtain screen configuration information named “Cake.html”. I do.
The data conversion device 13-2 that has received the data acquisition request message 2202 establishes a communication connection 2203 with the data relay device 14, and then indicates in the data acquisition request message 2202 that the data conversion device 13-2 has passed this data conversion device. The information is added, and this is transmitted to the data relay device 14 as a data acquisition request message 2204.
The data relay device 14 that has received the data acquisition request message 2204 establishes a communication connection 2205 with the data conversion device 13-1, and then transfers the message. The data conversion device 13-1 having received the data acquisition request message 2206 from the data relay device 14,
Communication connection 2 with data storage server 11-1
207, and then a data acquisition request message 2
206, information indicating that the data has passed through the data conversion apparatus is added, and this is added to the data acquisition request message 2208.
Is transmitted to the data storage server 11-1. Upon receiving the data acquisition request message 2208, the data storage server 11-1 extracts the requested screen configuration information named "Cake.html", includes it in the response message 2209, and extracts the screen configuration information from the data conversion device 13-1. Send to Thereafter, the communication connection with the data conversion device 13-1 is disconnected (2210). Response message 22
In the data conversion device 13-1 that has received 09, the conversion process 2211 is executed. Specifically, in FIG.
S1501 to S1507 are executed. As described above, the data conversion device 13-1 is itself the data conversion device closest to the data storage server, and the conversion target (screen configuration information) is converted by the data conversion device closest to the data storage server. It recognizes that it must be done, and performs the conversion processing of the screen configuration information. Conversion processing 22
The new screen configuration information generated in step 11 and the information indicating that the data has passed through the data conversion apparatus are included in the response message 2212.
And transmits the data to the data relay device 14. Thereafter, the communication connection with the data relay device 14 is disconnected (2213). The data relay device 14 that has received the response message 2212 transfers the response message to the data conversion device 13-2, and disconnects the communication connection with the data conversion device 13-2 (2215). In the data conversion device 13-2 that has received the response message 2214 from the data relay device 14, S1501 to S150 in FIG.
4, S1505 and S1508 are executed. That is, the data conversion device 13-2 recognizes that it is not a data conversion device that should perform the conversion process, and
Only the process of adding information indicating that the data has passed through the present data conversion device to 214 and sending it as a response message 2216 is performed. The new screen configuration information included in the response message 2216 from the data conversion device 13-2 is stored in the client terminal 10-1. afterwards,
The communication connection with the client terminal 10-1 is disconnected (2217).

Next, screen configuration information 9 will be described with reference to FIG.
A sequence when the client terminal requests acquisition of a still image according to the still image reference definition 91 (see FIG. 9) of 0 will be described.

10-1, 11-1, 13-1, 13-
2 and 14 are the same as in FIG. Client terminal 10-
1 establishes a communication connection 2301 with the data converter 13-2, and issues a data conversion instruction command “sm
"Rabit.small.jp" with "all" added
g "is transmitted to the data converter 13-2. In the data conversion device 13-2 that has received the data acquisition request message 2302, the conversion process 2318 and the accumulation process 2319 are executed. Specifically, in FIG. 13, S1301, S1302, S1302
1304 and S1307 to S1310 are executed. Thus, the data conversion instruction command “small” is separated from the message, and the separated instruction command “small” is separated.
all "is stored in the memory 23, and the instruction command" sm
"all" is stored in the message as comment information, and information indicating that the data has passed through the data converter is stored in the message. Thereafter, the data conversion device 13-2 establishes a communication connection 2303 with the data relay device 14, and executes the above-described message (“Rab
it. jpg ”is transmitted. Data converter 13
-2, the data relay device 14 having received the data acquisition request message 2304 establishes a communication connection 2305 with the data conversion device 13-1, and then transfers the message. Data conversion device 1 receiving data acquisition request message 2306 from data relay device 14
In 3-1 the accumulation process 2320 is executed. Specifically, in FIG. 13, S1301, S1304, S13
05, S1306, and S1310 are executed. As a result, the data conversion instruction comment “sm
all "is extracted, and the extracted instruction comment" sma
11 ”is stored in the memory 23, and information indicating that the data has passed through the data converter is stored in the message. Thereafter, the data conversion device 13-1 establishes a communication connection 2307 with the data storage server 11-1, and transmits the above-described message to the data storage server 11-1. Upon receiving the data acquisition request message 2308, the data storage server 11-1 reads “Rabit.jp”
g) is extracted, and the extracted still image data is included in the response message 2309, and the data conversion device 13-1
Send to Thereafter, the communication connection with the data conversion device 13-1 is disconnected (2310). In the data conversion device 13-1 receiving the response message 2309,
Conversion processing (reduction processing) 2311 is executed. Specifically, in FIG. 15, S1501 to 1507 are executed. Thus, the data conversion device 13-1 is itself the data conversion device closest to the data storage server;
Then, it recognizes that the data to be converted (still image data) must be converted by the data converter closest to the data storage server, and performs a reduction process on the still image data. The reduced still image data generated in the process and information indicating that the data has passed through the data converter are included in the response message 2312 and transmitted to the data relay device 14. Thereafter, the communication connection with the data relay device 14 is disconnected (2313). Response message 2
The data relay device 14 that has received 312 transfers this message to the data converter 13-2, and disconnects the communication connection with the data converter 13-2 (231).
5). Response message 231 from data relay device 14
In the data conversion device 13-2 that has received the packet No. 4 in FIG.
Steps 1501 to 1504, S1505, and S1508 are executed. That is, the data conversion device 13-2 recognizes that the data conversion device itself is not the data conversion device to perform the conversion process,
Information indicating that the data has passed this data conversion device is added to the response message
Only the process of transmitting as 16 is performed. The reduced still image data included in the response message 2316 from the data conversion device 13-2 is displayed on the display screen of the client terminal 10-1. After that, the client terminal 10-
Then, the communication connection with No. 1 is disconnected (2317).

Next, screen configuration information 9 will be described with reference to FIG.
A sequence when the client terminal requests acquisition of audio data in accordance with the audio data reference definition 93 of 0 (see FIG. 9) will be described.

10-1, 11-1, 13-1, 13-
2 and 14 are the same as in FIG. Client terminal 10-
1 establishes a communication connection 2401 with the data converter 13-2, and issues a data conversion instruction command “st
“music.stream.
A data acquisition request message 2402 “wav” is transmitted to the data converter 13-2. In the data conversion device 13-2 that has received the data acquisition request message 2402, the conversion process 2418 and the storage process 2419 are executed. Specifically, in FIG.
03, S1310 is executed. As a result, the data conversion instruction command "stream" is separated from the message, the separated instruction command "stream" is stored in the memory 23, and information indicating that the command has passed through the data converter is stored in the message. Is done. After that, the data conversion device 13-2 establishes a communication connection 2403 with the data relay device 14, and transmits the above-mentioned message (a request message for acquiring audio data named “music. Wav”) 2404. Data acquisition request message 2 from data converter 13-2
The data relay device 14 receiving the 404 establishes a communication connection 2405 with the data conversion device 13-1, and then transfers the message. Data relay device 1
13, the data conversion device 13-1 receives the data acquisition message 2406 from S4 in FIG.
1, S1304, S1305, and S1310 are executed. Thereafter, the data conversion device 13-1 establishes a communication connection 2407 with the data storage server 11-1, and transmits the above-described message to the data storage server 11-1. The data storage server 11-1 that has received the data acquisition request message 2408 transmits “music.wa”.
The voice data with the name “v” is extracted, included in the response message 2409, and transmitted to the data conversion device 13-1. Thereafter, the communication connection with the data conversion device 13-1 is disconnected (2410). Response message 2
In the data conversion device 13-1 which has received the data 409, FIG.
, S1501 to 1504, S1509, S15
10 is executed. That is, the data conversion device 13-1
Recognizes that it is not a data conversion device to be converted, adds only information indicating that the data conversion device has passed to the response message 2409, and sends only this as a response message 2412. .
Thereafter, the communication connection with the data relay device 14 is disconnected (2413). Receiving the response message 2412, the data relay device 14 transfers this message to the data converter 13-2, and disconnects the communication connection with the data converter 13-2 (2415). In the data converter 13-2 that has received the response message 2414 from the data relay device 14, a conversion process (voice data packetization process) 2420 is executed. Specifically, in FIG. 15, S1501 to S1504, S15
09, S1506, and S1507 are executed. As described above, the data conversion device 13-2 itself must be the data conversion device closest to the client terminal, and the conversion target (voice data) must be converted by the data conversion device closest to the client terminal. It recognizes that it is the one and executes the conversion processing of the voice data. The packetized data 2421 is stored in the client terminal 10-1.
, Where it is output as actual audio. Thereafter, the communication connection with the client terminal 10-1 is disconnected (2417).

An embodiment of the present invention has been described above. For example, a specification (FIG. 22) in which a data acquisition request message is issued in a normal format and data conversion is performed by the most upstream data conversion device. Specifications exemplified in
In a system employing only the above, it is possible to avoid duplication of the conversion process by simply storing the pass information in the response message in each data conversion device.

Further, for example, a specification is given in which a data acquisition request message is issued in a format including a conversion instruction command, and data conversion is performed by the most upstream data conversion device (FIG. 2).
If the system adopts only the specifications exemplified in 3),
The conversion instruction command of the data request message is separated and stored, the conversion instruction command is commented out, the data conversion instruction information may be notified to a data conversion device that may be present after the data conversion device, and a response message is received. In this case, it is possible to check whether or not the message has passed through the data conversion device and perform the data conversion process when the message has not passed through the data conversion device, thereby avoiding duplication of the conversion process.

Also, for example, a specification is given in which a data acquisition request message is issued in a format including a conversion instruction command, and data conversion is performed by the most downstream data conversion device (FIG. 2).
If the system adopts only the specifications exemplified in 4),
When a data acquisition request message to which a conversion instruction command is added is received, the conversion instruction command may be separated and accumulated to prevent execution of data conversion processing by a device other than the data conversion device.

[0084]

According to the present invention, even if a plurality of data converters exist in a network system, data conversion processing does not overlap. It is also possible to execute data conversion by an appropriate data conversion device depending on the type of data.

[Brief description of the drawings]

FIG. 1 is a configuration diagram of a network system according to an embodiment of the present invention.

FIG. 2 is a configuration diagram of the data conversion device of FIG. 1;

FIG. 3 is a configuration diagram of a data conversion program of FIG. 1;

FIG. 4 is a view showing an example of a page displayed on the client terminal in FIG. 1;

FIG. 5 is a view showing an example of a page referred to from the page of FIG. 4;

FIG. 6 is a diagram illustrating an example of screen configuration information that defines the screen configuration of the page in FIG. 4;

FIG. 7 is a diagram showing an example of a page displayed when the data of the page in FIG. 4 is converted by a data conversion device.

FIG. 8 is a view showing an example of a page referred to from the page of FIG. 7;

9 is a diagram showing an example of screen configuration information that defines the screen configuration of the page in FIG. 7;

FIG. 10 is a view showing an example of a data acquisition request message used in the network of FIG. 1;

FIG. 11 is a diagram showing an example of a response message used in the network of FIG. 1;

FIG. 12 is a flowchart of processing of a data conversion program on the data conversion device of FIG. 1;

FIG. 13 is a flowchart showing details of conversion processing of the data acquisition request message of FIG. 12;

FIG. 14 is a view showing an example of a table used in the conversion processing of FIG. 13;

FIG. 15 is a flowchart showing details of a response message conversion process of FIG. 12;

FIG. 16 is a diagram showing an example of a table used in the conversion processing of FIG. 15;

FIG. 17 is a flowchart of a screen configuration data conversion process, which is one of the conversion processes in FIG. 15;

FIG. 18 is a diagram showing an example of a table used in the processing of FIG. 17;

FIG. 19 is a flowchart of a still image reduction process which is one of the conversion processes in FIG.

20 is a flowchart of a moving image / still image conversion process, which is one of the conversion processes in FIG.

FIG. 21 is a flowchart of an audio stream conversion process which is one of the conversion processes in FIG. 15;

FIG. 22 is a diagram showing an example of a sequence when a client terminal requests acquisition of screen configuration information in the network system of FIG. 1;

FIG. 23 is a diagram showing an example of a sequence when the client terminal requests acquisition of a still image defined as an upstream conversion target in the network system of FIG. 1;

FIG. 24 is a diagram showing an example of a sequence when a client terminal requests acquisition of audio data defined as a downstream conversion target in the network system of FIG. 1;

[Explanation of symbols]

10 client terminal, 11 data storage server, 1
2, 20: network, 13: data converter, 14
... data relay device, 21 ... communication control unit, 22 ... storage device, 23 ... memory, 24 ... processor, 25 ... display, 26 ... keyboard, 27 ... mouse, 28 ... internal bus, 30 ... data conversion program

──────────────────────────────────────────────────続 き Continued on the front page (51) Int.Cl. ⁶ Identification code FI H04L 12/58 H04N 7/173 (72) Inventor Tomohisa Kohiyama 1099 Ozenji Temple, Aso-ku, Kawasaki City, Kanagawa Prefecture Hitachi, Ltd. System Development Research, Hitachi, Ltd. In-house (72) Inventor Mitsuo Hayashi 890 Kashimada, Saiwai-ku, Kawasaki-shi, Kanagawa Pref.Information Systems Division, Hitachi, Ltd. (72) Inventor Yasuo Kuwahara 5030 Totsukacho, Totsuka-ku, Yokohama-shi, Kanagawa Prefecture Software Development Division, Hitachi, Ltd. Inside

Claims (9)

[Claims] 1. A data conversion device installed in a network having a data storage server for storing various data and a client terminal for displaying data of the data storage server. First, a message sent from the client terminal is received directly or via another data conversion device, and the message is sent to the data storage server or another data conversion device as it is or with its contents changed as it is. Conversion means, and directly or, via another data conversion device, receives a message issued from the data storage server, and receives the message as it is or changes its content to the client terminal or another data conversion device. And a second conversion unit for transmitting the message. When a predetermined conversion instruction command is included in the storage unit, the storage unit stores identification information for specifying a data conversion device to be subjected to data conversion. Means for judging, using at least two pieces of information, whether the data to be converted is data to be converted by the present conversion device when the received message contains data to be converted, When it is determined that the data is data to be converted by the device, the device has means for executing a conversion process of the data. A data conversion device, wherein the information is one of information indicating whether or not the identification information is stored in the storage means and information indicating a type of the data. . 2. A data conversion device installed in a network having a data storage server for storing various data and a client terminal for displaying the data of the data storage server, wherein each of the data conversion devices includes storage means First, a message sent from the client terminal is received directly or via another data conversion device, and the message is sent to the data storage server or another data conversion device as it is or with its contents changed as it is. Conversion means, and directly or, via another data conversion device, receives a message issued from the data storage server, and receives the message as it is or changes its content to the client terminal or another data conversion device. And a second conversion unit for transmitting the message. When a predetermined conversion instruction command is included in the storage unit, the storage unit stores identification information for specifying a data conversion device to be subjected to data conversion. If the received message includes data to be converted and belongs to a predetermined first group and the message has not passed through another data conversion device, Executes a predetermined conversion process to be performed on the received message, the received message includes data to be converted and belongs to a predetermined second group, and the identification information is A data conversion apparatus comprising: means for executing a predetermined conversion process to be performed on the data when stored in a storage means. 3. A data conversion device installed in a network having a data storage server for storing various data and a client terminal for displaying the data of the data storage server, wherein each of the data conversion devices includes a storage unit and a storage unit. A first conversion unit that receives a message issued from the client terminal directly or via another data conversion device and proceeds with the processing; and directly or another message generated from the data storage server. A second conversion unit that receives the data via the data conversion device and proceeds with the processing, wherein the first conversion unit determines whether the received message includes a command for instructing data conversion, When a command is included, first processing means for analyzing the content of the command; When instructing to perform data conversion with the data conversion device closest to the ant terminal, a message in which the command is deleted is generated from the message, and predetermined identification information corresponding to the command is generated. Second processing means for writing to the storage means, and if the content of the command instructs to perform data conversion by a data conversion device closest to the data storage server, or Third processing means for determining whether or not the message has passed through another data conversion device when the command to instruct is not included; and the third processing means for determining whether the message has passed through another data conversion device. If it is determined that the comment is included in the message, it is determined whether the message includes a comment instructing data conversion. Is included, a fourth processing unit that writes predetermined identification information corresponding to the comment into the storage unit, and when it is determined that the message has not passed through another data conversion device. It is determined whether or not the message includes a command for instructing data conversion. If the command is included, a message in which the command is deleted is generated from the message. ,
Fifth processing means for writing predetermined identification information corresponding to the command into the storage means, and further, writing a comment instructing data conversion in the message; and generating the second, fourth, and fifth processing means. And a sixth processing unit for receiving the selected message for selection, writing information indicating that the message has passed through the present conversion device into the received message, and sending the message to the data storage server or another data conversion device. A second processing unit configured to determine whether or not the received message includes data to be converted; and a data conversion unit that determines that the data to be converted is closest to the data storage server. Data to be converted by the device and data to be converted by the data converter closest to the client terminal. Eighth processing means for judging which one of them, and when the data to be converted is determined to be data to be converted by a data converter closest to the data storage server, the message Is determined to have passed through another data converter, if the message is not passed through another data converter,
Ninth processing means for performing a predetermined conversion process to be performed on the data, determining that the data to be converted is data to be converted by a data conversion device closest to the client terminal In this case, it is determined whether or not the identification information is stored in the storage unit. If the identification information is stored, a predetermined conversion process to be performed on the data is performed. A tenth processing means to be executed; and an eleventh processing means for selectively receiving a message generated by each conversion processing of the ninth and tenth processing means and transmitting the received message to the client terminal or another data conversion device. A data conversion device comprising processing means. 4. A plurality of data converters installed in a network having a data storage server for storing various data and a client terminal for displaying the data of the data storage server, wherein each data converter has storage means A first conversion unit that receives a message issued from the client terminal directly or via another data conversion device and proceeds with the processing; and directly or another message generated from the data storage server. A second conversion unit that receives the data via the data conversion device and proceeds with the processing, wherein the first conversion unit determines whether the received message includes a command for instructing data conversion, If a command is included, a message in which the command is deleted is generated from the message, and Means for writing predetermined identification information corresponding to the command into the storage means, wherein the second conversion means determines whether or not the received message includes data to be converted. If it is determined that the data to be converted is included, it is determined whether or not the identification information is stored in the storage unit, and if the identification information is stored,
A data conversion device comprising means for executing a predetermined conversion process to be performed on the data. 5. A plurality of data converters installed in a network having a data storage server for storing various data and a client terminal for displaying data of the data storage server, wherein each of the data converters is a client terminal. A first conversion unit that receives a message issued from the server directly or through another data conversion device and proceeds with the processing; and directly receives a message issued from the data storage server or another data conversion device. A second conversion unit that receives the received message and proceeds with the processing, wherein the second conversion unit determines whether the received message includes data to be converted, and a conversion target. If it is determined that data is included, it is determined whether the message has passed through another data conversion device. Disconnection and, if the message is not the one passing through the other of the data conversion device, data conversion apparatus characterized by comprising means for performing a predetermined conversion process to be performed with respect to the data. 6. The apparatus according to claim 1, wherein said second conversion means receives, as a conversion target, screen configuration information necessary for displaying data at said client terminal, and converts the screen configuration information. In this case, from the received screen configuration information, element information that defines the conversion processing content is extracted, each element information is converted, and the converted element information is added to the received screen configuration information. Data conversion device. 7. A network system having the data conversion device according to claim 1, 2, 3, 4, 5, or 6. 8. A method for managing a plurality of data conversion apparatuses installed in a network having a data storage server for storing various data and a client terminal for displaying the data of the data storage server, comprising: When a message including an instruction command belonging to the determined first group is issued, predetermined identification information is stored in all of the data conversion devices that pass through the message to the data storage server; When a message including an instruction command belonging to a predetermined second group is issued from the client terminal, a predetermined one of the data conversion devices through which the message passes until reaching the data storage server. The identification information is stored only in the conversion device, and the first When a message including the data to be converted belonging to the loop is issued, the data of the data to be converted is determined by a predetermined conversion device among the data conversion devices through which the message reaches the client terminal. When the conversion is performed, and a message including the data to be converted belonging to the second group is issued from the data storage server, the data conversion device in which the identification information is stored includes A method for managing a data conversion device, comprising performing data conversion of data. 9. A recording device for recording a data conversion program used in a plurality of data conversion devices installed in a network having a data storage server for storing various data and a client terminal for displaying the data of the data storage server. In the medium, the data conversion program receives the message issued from the client terminal directly or via another data conversion device, and changes the content of the message as it is or changes the content, and the data storage server or another A first conversion process to be sent to a data conversion device, and a message issued from the data storage server received directly or via another data conversion device, and the message is received as it is or the content is changed, and A second conversion process to be sent to the terminal or other data conversion device In the first conversion process, when the received message includes predetermined conversion instruction information, identification information for specifying a data conversion device to be subjected to data conversion is stored in the data conversion device. In the second conversion process, when the received message includes data to be converted, at least two pieces of information are used to determine whether the data is data to be converted by the conversion device. When it is determined that the data is data to be converted by the present conversion device, a conversion process of the data is executed. Indicates any one of information on a message passage route and information indicating whether or not the identification information is stored in the storage unit, and a type of the data. Recording medium, which is a multi-address.