JP2001290741A - Network system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a network system in which a user can browse WWW by transmitting information such as a mail address including in a URL. SOLUTION: A gateway server 11 receives a request for a virtual URL, for instance, 'http://user abcd.co.jp/' from a client 15. The server 11 sends the URL to a database server 12, and the server 12 retrieves the original URL corresponding to the URL and returns retrieval results to the server 11. The server 11 transfers the original URL to a WWW server 13, and the server 13 sends a file corresponding to the original URL to the server 11. The server 11 returns the received file to the client 15. The sever 11 may transmit a file in which the original URL is described to the client 15 by a frame tag.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a network system capable of transmitting information in response to an external request.

[0002]

2. Description of the Related Art In recent years, the Internet has rapidly spread, and accordingly, the use of Internet mail and the World Wide Web (hereinafter, "WWW") has become common. Internet mail (hereinafter referred to as "mail") is usually created by software on a client, and the created mail is passed to a mail server on the same network as the client. Then, this mail server sends the received mail to the destination mail server. The destination of the mail can be specified by the mail address. The mail address is usually described in the format of “user account name @ mail server name”, and the recipient of the mail can be specified by the user account name. In addition, recently, an email address is widely written on business cards and the like.

[0003] Also, WWW is a WW on the Internet.
This is for browsing information on a W server, and indicates a URL (Uniform Resource) indicating the location of the information.
The information can be browsed by using information called “rc.Locator”. The URL is "protocol name ///
WWW server (host) name / directory name / (file name /) ". By transmitting this to the Internet from a client, browsing target information can be obtained. The directory name is "directory name / directory name /
. ", And the user account name in the mail address may be used as it is as the directory name. Further, it is common for a person having an e-mail address to provide some information on the WWW.

[0004] Incidentally, although it is widely used to describe one's own mail address on a business card or the like, describing a URL indicating the location of information provided by oneself has not been generalized yet. Therefore, a situation often occurs in which a person who knows the mail address of an acquaintance or the like does not know the URL indicating the location of the information provided by the person. In such a situation, in order to browse the WWW, it is necessary to inquire the person who provides the information or the person who knows the URL in advance, which is an extremely complicated operation.

[0005] In addition, the user account name and mail server name of the mail address are partially or entirely the same as the WWW server name and directory name of the URL, and the URL can be guessed from the mail address in many cases. However, when there are a plurality of directory names or when it is necessary to specify a file name, it is difficult to guess.

[0006] Further, the mail address and the URL are often given to the user from an Internet connection company, and the Internet connection is limited by economic and environmental factors such as service contents, usage fee, connection place, and the like. Changing the trader is often done. At this time, the mail address and the URL must be changed. In this case, both the e-mail address and the URL must be notified to an acquaintance or the like, which is an extremely complicated operation. Therefore, not a few people neglect to contact their acquaintances,
As a result, information continues to be transmitted to an e-mail address or URL that does not already exist, or exists but is not used, or exists but is already used by another person. The above data transfer resources are significantly wasted.

[0007]

SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned circumstances, and a network system in which a user can browse WWW by transmitting information including a mail address and the like in a URL. The purpose is to provide. Further, the user can browse the WWW by transmitting the information such as the mail address in the URL, and change the transfer destination mail address and the URL by additionally setting the mail address as the transfer source mail address. It is an object of the present invention to provide a network system which can eliminate the need for contacting the related parties by the above and can effectively use the data transfer resources on the Internet.

[0008]

According to the present invention, in a network system, a table is stored in which second information indicating where the first information is located and third information are stored, and a table is received. A database server that searches the table based on third information and transmits the second information corresponding to the third information; and a database server that receives the third information from the outside. Transferring the third information, transferring the second information received from the database server device to a world wide web server device storing the first information, and receiving the third information from the world wide web server device. And a gateway server device for transferring the first information to the outside.

As described above, since the first information corresponding to the third information received by the gateway server is transmitted, the information which cannot be directly processed by the world wide web server is transmitted. Can also respond. Note that examples of information that cannot be directly processed by the world wide web server include a URL described in a format different from usual. Further, the world wide web server device may be provided on the same network system as the database server device and the gateway server device, or may be provided on a different network system.

[0010] When the second information is not transmitted to the world wide web server device to which the second information is to be transmitted, the gateway server device transmits the second information to the world wide web server device. Information indicating that the information has not been delivered can be transmitted to the outside. Thus, it is possible to notify the outside that the second information has not been delivered to the world wide web server device.

When the gateway server receives information indicating that the first information does not exist from the world wide web server, the gateway server does not include the first information in the world wide web server. Can be transmitted to the outside. Thus, it is possible to notify the outside that the first information does not exist in the world wide web server device.

[0012] When the gateway server device receives fourth information associated with the first information from the world wide web server device or a world wide web server device different from the world wide web server device, 4 can be transferred to the outside. This allows the gateway server device to transfer not only the first information but also the fourth information associated with the first information to the outside.

According to the present invention, in a network system, a table in which second information indicating where the first information is located and third information are stored, and the received third information is stored. A database server device that searches the table based on the information and transmits the second information corresponding to the third information;
When the third information is received, the third information is transferred to the database server device, and the second information received from the database server device is automatically converted to a format in which the first information can be obtained. And a gateway server device which transfers the file to the outside in one file.

As described above, since the first information corresponding to the third information is transmitted to the third information received by the gateway server device, the information which cannot be directly processed by the world wide web server device is transmitted. Can also respond. Also, the gateway server device automatically includes the first information in the first file in a format that can be obtained and transfers the first file to the outside, so that the gateway server device transmits the first information from the world wide web server device. There is no need to transfer the first information to the outside, and the load on the gateway server device can be reduced.

[0015] The first file is an HTML format that describes a uniform resource locator indicating the location of the first information in association with a tag capable of automatically acquiring the first information. File. Thus, the requester can obtain the first information only by returning a file having a small data amount to the requester of the first information.

The gateway server device may automatically convert the fifth information indicating the location of the fourth information associated with the first information into a format in which the fourth information can be obtained. The file can be included in a second file and can be transferred to the outside. This eliminates the need for the gateway server device to transmit or transfer the fourth information associated with the first information, and can reduce the load on the gateway server device. Further, the fourth information can be automatically acquired by an external device.

Further, the second file is an HTML format describing a uniform resource locator indicating the location of the fourth information in association with a tag capable of automatically acquiring the fourth information. Can be a file. Thus, the requester can obtain the fourth information associated with the first information only by returning a file having a small data amount to the requester of the first information.

Further, when the second information associated with the third information received from the outside does not exist in the database server device, the gateway server device transmits the third information to the database server device. Information indicating that the associated second information does not exist can be transmitted to the outside. Thus, when the second information corresponding to the third information received from the outside does not exist on the table of the database server, the gateway server notifies the outside that the second information cannot be found. Can be.

The third information may be a uniform resource locator describing an Internet mail address instead of a host name. Thereby, even if the host name of the world wide web server device where the first information exists is not known, if the user knows the Internet mail address, the uniform resource locator can be described using the mail address. it can.

[0020]

FIG. 1 is a block diagram showing an embodiment of a network system according to the present invention. In the figure,
10 is a network system, 11 is a gateway server, 12 is a database server, 13 is a WWW server,
14 is the Internet, 15 is the client, 16 is L
AN.

The network system 10 includes a gateway server 11, a database server 12, and a WWW server 13, which are connected to one another via a LAN 16. As will be described later, when a reply request for information is received from the outside by a URL describing a mail address instead of a WWW server name, a WWW server corresponding to the domain name of the mail address or a mail address of the mail address An HTML (HyperText Mark-up) is sent from a WWW server that does not support the domain name.
A document file in a (Language) format or an image file associated with the document file can be returned to the request source.

Note that the WWW server 13 may be provided on a network system other than the network system 10. Also, instead of the WWW server 13, FTP
(File Transfer Protocol) server. Although not shown, a router is provided between the gateway server 11 and the Internet 14 in addition to the above-described server, and serves as a boundary between the LAN 16 and the Internet 14. Further, a DNS server is provided on the LAN 16 and stores a zone file related to the network system 10. In addition, a server such as a mail server may be provided in addition to the above.

The gateway server 11 performs various operations in response to external requests. In particular, a virtual URL describing an e-mail address instead of a WWW server name from outside,
For example, from the client 15, "http: // user
{Abcd. co. jp ”is received, then“ u ”
ser @ abcd. co. jp ”, that is, the mail address portion is transmitted to the database server 12.
Then, as a result of performing a search in the database server 12, the original URL corresponding to the mail address, for example, “http://www.abcd.co.jp/
~ User / index. When the “html” is received, the URL is transferred to the WWW server 13. And WW
When a file corresponding to this URL, that is, “index.html” is received from the W server 13, the file is transmitted to the client 15. Alternatively, the received URL is transmitted to the client 15 in a form in which a file corresponding to the URL, that is, “index.html”, an image file associated with this file, and other files can be automatically acquired. of course,
It is also possible to receive and process the original URL.
Note that the mail address “abcd.
co. jp "is the name of the network system 1
0 is described in the zone file associated with the file.

Alternatively, as a result of performing a search in the database server 12, the original URL corresponding to this mail address, for example, “http: //www.efgh.
co. jp / ~ user / index. When the “html” is received, the URL is transferred to the WWW server 13.
When the file corresponding to this URL, that is, “index.html” is received from the WWW server 13, the file is transmitted to the client 15. Alternatively, the received URL is transmitted to the client 15 in a form in which a file corresponding to the URL, that is, “index.html”, an image file associated with this file, and other files can be automatically acquired. Note that the domain name of the URL “efgh.co.jp” may not be described in the zone file related to the network system 10. Further, the gateway server 11 may share a machine with a DNS server or another server.

The virtual URL is stored in the database server 1
The gateway server 11 may perform a syntax check on whether or not it is described in a format that can be searched in step 2. For example, when the mail account name must be described in only 1-byte code, and when the mail account name is received in 2 byte code, the request is rejected, so that the load on the database server 12 can be reduced. become. Of course, as a reverse configuration, a 2-byte code mail account name can be used for URL display.

When transmitting to the client 15,
As will be described later, using the frame structure, for example, a frame to be an output target is provided in a frame of the top page, and the page of the frame to be an output target is set on the gateway server 11 so as to be a page corresponding to the mail address. May be controlled by the above program. In addition,
In the frame structure, any page or image can be assigned to a page other than the page corresponding to the mail address. For example, a banner advertisement or a guide page of the system according to the present invention can be assigned. Further, the banner advertisement or the guide page of the system according to the present invention may be provided with a link to the banner advertisement or the like on the page of the frame as the output target, or may jump to the banner advertisement or the like using a jump tag. The banner advertisement and the like may be stored in the WWW server 13 or may be stored in another WWW server. Therefore, various information can be transmitted to the WWW viewer.

Further, as a result of performing a search in the database server 12 in response to a request from the client 15 or the like, when the original URL corresponding to the mail address is not found, or when the file corresponding to the original URL is stored in the WWW server 13 If not found, a message indicating that the URL was not found or a message indicating that the file was not found can be returned to the client 15 or the like.

The database server 12 has a UR including a mail address and a server (host) name of the WWW server 13.
A table and database software corresponding to L are stored. This table is searched and the search result is transmitted to the gateway server 11. Therefore, for example, “user@abcd.co.
jp "is sent, the original URL corresponding to this mail address is" http
p: // www. abcd. co. jp / ~ user /
index. html ", the URL can be sent back to the gateway server 11.

In the network system, only one domain name (zone) is managed, for example, "a
bcd. co. jp "only, use
r ”, that is, only the part to the left of“ ＠ ”is the original URL
It is good also as a table made to correspond. In this case, the gateway server 11 transmits only the “user” part. Also, the email account name, that is, ＠
The "user" part on the left side of "" may be another identifier, for example, a telephone number of the user, and the identifier may be used for search.

[0030] The WWW server 13 stores a file for making WWW browsable, WWW server software, etc., and sends back a file corresponding to the URL transmitted from the gateway server 11 to the gateway server 11. Instead of placing a file on the WWW server 13 or registering a URL indicating a WWW server on a network different from the network system 10 in the database server 12 in association with a mail address, a redirect indicator is added to a predetermined file. W on a network different from the network system 10
The URL indicating the WW server may be described in association with “user”. In this case, the request for the WWW server 13 can be transferred to a WWW server on a network different from the network system 10.
Further, a plurality of WWW servers 13 can be provided on the network system 10. Also, as described above, W
The WW server 13 may be on a network system different from the network system 10.

The Internet 14 is connected to many networks, and enables files to be transmitted and received between the networks. The client 15 belongs to a different network from the network system 10 and has a browser installed. Although not shown, a router and a DNS server are provided on the network to which the client 15 belongs, and can communicate with the network system 10 using a protocol such as http. Of course, the number of clients is not limited to three, and any number of clients may be connected.

Next, an operation example in the network system 10 will be described. FIG. 2 shows the UR according to the present invention.
13 is a flowchart illustrating an example of a processing procedure of L. First, in S11, when the gateway server 11 receives a file acquisition request using the http protocol from the client 15 or the like, for example, the URL processing program acquires the requested URL from the information related to the file acquisition request. Here, it is assumed that the request is received at http 1.1.

Next, in S12, it is determined whether the received URL is a virtual URL including a mail address or not.
RL is determined. If the URL is a virtual URL including a mail address, the left side from $ is ignored, so "http: //user@abcd.co.
jp "is the same request as" http://abcd.co.jp ". Therefore, "http: // user @ a
bcd. co. jp "to" http: //abcd.c
o. jp ". Therefore,
“Http://abcd.co.jp/index.
html "or" http: //abcd.c
o. jp / index. html ”in the frame configuration, and the file called in the
By writing a script language function that obtains the L window, it is actually "http: //user@abcd.c
o. jp ”request, the gateway server 11
Can be conveyed to. And the database server 1
2 and sends the virtual URL to S13. Also, the original U
If it is RL, there is no need to search the database server, so the process proceeds to S15. In S13, the database server 12 searches the virtual URL for the original URL. Then, the search result is returned to the gateway server 11, and the process proceeds to S14.

In S14, as a result of the search, the original URL
It is determined whether or not is found. If found,
In S15, the URL is transferred to the WWW server 13, and in S1
Proceed to 6. If not found, the process proceeds to S18, where the client 15 is notified that the original URL corresponding to the mail address has not been found, and the process ends. In S16, it is determined from the response of the WWW server 13 whether or not the file corresponding to the original URL exists in the WWW server 13. If the file exists, the file is returned to the client in S17, and the process ends. If the file does not exist, the process proceeds to S18, in which the client 15 is notified that the file has not been found, and the process ends. Alternatively, the URL found in S14 is
L, that is, “index.htm”
l "and the image file and other files associated with this file are transmitted to the client 15 in a form that can be automatically acquired, and the processing is terminated.

By processing according to the above procedure, WWW
Virtual U including mail address that cannot be handled by server 13
In response to a request by the RL, a file provided by the person having the mail address on the WWW can be returned. Note that the URL processing procedure in the present invention is not limited to the above-described procedure, and may be, for example, the following. That is, the gateway server externally describes a mail address and a directory having one or more layers in place of the WWW server name instead of the WWW server name, for example, from the client 15 to “http: // user @”.
abcd. co. jp / ijkl / mnop. htm
l ”. In this case, "user @ abc
d. co. jp ”, that is, the mail address portion is transmitted to the database server 12.

Then, as a result of performing a search in the database server 12, the original URL corresponding to the mail address, for example, “http: //www.efgh.
co. jp / ~ user / "," http
p: // www. efgh. co. jp / ~ user /
ijkl / mnop. html ", and transfers the URL to the WWW server 13.
When the file corresponding to the URL, that is, “mnop.html” is received from the WWW server 13, the file is transmitted to the client 15. Alternatively, the found URL is transmitted to the client 15 in a form capable of automatically acquiring a file corresponding to the URL, that is, “mnop.html”, an image file associated with the file, and other files.
In this case, it is possible to handle a case where the original URL of the requested file describes a directory having two or more layers.

Next, the order of communication between each server and client according to the above-described virtual URL processing procedure will be described. FIG. 3 is an explanatory diagram showing an outline of a communication procedure between each server and a client in the present invention. The following description is based on the assumption that the original URL corresponding to the virtual URL exists in the table, and the file corresponding to the original URL is WW.
It is assumed that it exists in the W server 13.

First, a virtual URL,
For example, "http: //user@abcd.co.j
p / "in the gateway server 1
1 receives (A). Then, the gateway server 11 searches the original URL corresponding to the virtual URL by sending the virtual URL to the database server 12 (B). Then, the database server 12 returns the search result, that is, the original URL to the gateway server 11 (C). The gateway server 11 uses the original URL
Is transferred to the WWW server 13 (D). At this time, it does not matter where the WWW server 13 exists on the Internet. Then, the WWW server 13 stores the file corresponding to the original URL in the gateway server 1.
Send to 1 (E). The gateway server 11 returns the received file to the client 15. As described above, it is possible to browse WWW using the mail address.

Therefore, it is possible to acquire the information to be browsed based on the mail address of the provider of the information to be browsed without knowing the original URL corresponding to the information to be browsed. Therefore, even if the original URL is changed, the database server 1 responds accordingly.
As long as the second table is updated, it is not necessary for the information provider to notify a large number of viewers of the changed URL.

This mail address may be a transfer source mail address of a mail transfer service provided by an ISP or the like. In this case, it functions as one address representing both the URL and the transfer destination mail address. Therefore, if the proxy address is contacted once to the person who wants to browse the WWW and the person who wants to send the mail, the proxy address and the URL are registered in the database server 12 in association with each other, and the proxy address is registered. By registering the URL and the transfer destination e-mail address in an arbitrary mail transfer server, even if the URL and the transfer destination e-mail address are changed, it is possible to transmit WWW information and receive mail. Therefore, the mail address transfer service itself is already known, but in the example of this embodiment of the present invention, it is known that mail and the main service on the Internet, WWW, can be used with only one address. There are different advantages to those of

Further, in the present invention, instead of the configuration in which the WWW server 13 sends the file corresponding to the original URL to the gateway server 11, the client 15
It is also possible to be sent to. This alternative embodiment will be described in detail below. FIG. 4 is an explanatory diagram showing an outline of a communication procedure between each server and a client in another embodiment of the network system of the present invention. Reference numeral 17 denotes a WWW server, which does not belong to the network system 10 in FIG.

That is, as shown in FIG. 4, the client 15 sends a virtual URL, for example, “http: // use”
r @ abcd. co. jp / "is received by the gateway server 11 (A). Then, the gateway server 11 searches the original URL corresponding to the virtual URL by sending the virtual URL to the database server 12 (B). Then, the database server 12 retrieves the search result, that is, the original URL “http://www.efgh.co.jp/in.
dex. html "to the gateway server 11 (C). Therefore, (A), (B), and (C) are the same as those shown in FIG.

Next, the gateway server 11 generates a calling file in which the original URL is specified in the frame tag, and transmits it to the client 15 (D). Upon receiving this file, the client 15 automatically requests the WWW server 17 to obtain the original URL file (E). This request is made by the client 15, and it does not matter where the WWW server 17 exists on the Internet. Then, the WWW server 17 sends a file corresponding to the original URL to the client 15 (F).

Here, a call file transmitted from the gateway server 11 to the client 15 will be described. FIG. 5 is an explanatory diagram showing the relationship between files related by the frame structure of the present invention. In FIG.
The file used for the call is the gateway server 11
And the original URL in the frame tag "http: //www.efgh.
co. jp / index. html ”is specified. Therefore, when the browser of the client 15 reads the call file, it automatically reads the file corresponding to the original URL. Note that the calling file itself is a file that defines the frame structure, and is not displayed on this browser. Further, as described above, if an advertisement file and the like are specified in the frame tag in addition to the original file, it is possible to read the file into the browser.

As described above, when the frame structure is used,
The domain name of the original URL “efgh.co.jp” may not be described in the zone file related to the network system 10. Therefore, even when the WWW server 13 does not exist in the network system 10, the same operation as the embodiment shown in FIG. 1 can be achieved. Of course, this frame structure can be applied to the embodiment shown in FIG. In addition, files other than the top page can be appropriately acquired from the WWW server 13 and / or the WWW server 17 according to the contents of the virtual URL. Further, the operation shown in FIGS. 3 and 4 may be enabled in one network system 10. In this case, gateway server 1
The operation shown in FIG. 3 and the operation shown in FIG. 4 may be selectively used depending on the virtual URL received by the device 1.

In addition to the frame structure, a script executed on the client side, a jump tag,
Alternatively, an HTTP response header or the like may be used and controlled by a program on the gateway server 11 so that these are transmitted to the client 15.

In the above-described embodiment, the virtual URL using the mail address is used. However, other than this, for example, a sub-domain is assigned to each user, and the sub-domain is included. When a request by a URL is received, it may be possible to simultaneously return a file corresponding to the original URL.
In this case, needless to say, it is necessary to set each subdomain in the DNS server.

[0048]

As is apparent from the above description, according to the present invention, in response to a request by a virtual URL using a mail address, a file corresponding to the original URL is returned, so that the original URL is notified. There is an effect that it becomes possible for those who do not have access to the WWW. In addition, it is possible to prevent waste of data transfer resources on the Internet, such as requesting transmission of information to a URL that does not already exist. Furthermore, by using the transfer source mail address of the mail transfer service, one proxy address can be permanently used on the Internet regardless of the change of the URL or the transfer destination mail address in the future, and the convenience of the Internet Is significantly increased.

[Brief description of the drawings]

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

FIG. 2 is a flowchart illustrating an example of a URL processing procedure in the network system according to the embodiment of the present invention.

FIG. 3 is an explanatory diagram showing an outline of a communication procedure between each server and a client in one embodiment of the network system of the present invention.

FIG. 4 is an explanatory diagram showing an outline of a communication procedure between each server and a client in another embodiment of the network system of the present invention.

FIG. 5 is an explanatory diagram showing the relationship between files related by the frame structure of the present invention.

[Explanation of symbols]

 10 Network System 11 Gateway Server 12 Database Server 13 WWW Server 14 Internet 15 Client 16 LAN 17 WWW Server

Continued on the front page (72) Inventor Yasunori Nonoichi 1-39-29 Nakagawa-chuo, Tsuzuki-ku, Yokohama-shi, Kanagawa Prefecture Grace Mansion 203 Planning Indoor Co., Ltd. −29 Grace Mansion 203 Planning Inc. Indoor

Claims (10)

[Claims] A second information indicating a location of the first information;
A table in which the third information is associated with the third information is stored, the table is searched based on the received third information, and the second information corresponding to the third information is transmitted. A database server device, transferring the third information to the database server device when the third information is received from the outside, and transmitting the second information received from the database server device to the first
And a gateway server for transferring the first information received from the world wide web server to the outside, and transferring the first information received from the world wide web server to the outside. 2. The gateway server device, when the second information is not transmitted to the world wide web server device to which the second information is to be transmitted, sends the second information to the world wide web server device. The network system according to claim 1, wherein information indicating that the information has not been delivered can be transmitted to the outside. 3. When the gateway server device receives information indicating that the first information does not exist from the world wide web server device, the gateway server device does not have the first information in the world wide web server device. 3. The network system according to claim 1, wherein information indicating the fact can be transmitted to the outside. 4. 4. The gateway server device, when receiving fourth information associated with the first information from the world wide web server device or a world wide web server device different from the world wide web server device, 4. The network system according to claim 1, wherein the fourth information can be transferred to the outside. 5. A second information indicating where the first information is located.
A table in which the third information is associated with the third information is stored, the table is searched based on the received third information, and the second information corresponding to the third information is transmitted. A database server device, transferring the third information to the database server device when the third information is received from the outside, and automatically transferring the second information received from the database server device to the first information. A gateway server for transferring the information to a first file in a format in which information can be obtained and transferring the information to the outside. 6. An HTML format in which the first file describes a uniform resource locator indicating the location of the first information in association with a tag capable of automatically acquiring the first information. 6. The network system according to claim 5, wherein the file is a file. 7. The gateway server device changes the fifth information indicating the location of the fourth information associated with the first information into a format in which the fourth information can be automatically acquired. 6. The network system according to claim 5, wherein the network file can be transferred to the outside by being included in a second file. 8. The HTML file in which the second file describes a uniform resource locator indicating the location of the fourth information in association with a tag capable of automatically acquiring the fourth information. The network system according to claim 7, wherein the network system is a file. 9. The gateway server device, wherein the second information associated with the third information received from the outside does not exist in the database server device.
9. The system according to claim 1, wherein information indicating that the second information associated with the third information does not exist in the database server device can be transmitted to the outside. The network system according to 1. 10. The system according to claim 1, wherein the third information is a uniform resource locator describing an Internet mail address instead of a host name.
The network system according to claim 9.