JP6182711B1 - Message notification method, server and program using URL - Google Patents

Abstract

Provided is a method for a transmission source terminal operated by a transmission source user to easily transmit a predetermined message to a destination address without activating a message transmission / reception application. A message notification server includes an address table storing addresses of a transmission source user and a destination user, page storage means storing a page of a URL that can identify the transmission source user and the destination user, and a page directed to the URL. Message transmitting means for transmitting a predetermined message when receiving a request, with an address based on the source user identified by the URL as a source address and an address based on the destination user identified by the URL as a destination address; Have The server transmits a predetermined message when the addresses of the transmission source user and the destination user are registered in the address table. [Selection] Figure 1

Description

  The present invention relates to a technique for transmitting a message (e-mail, SMS (Short Messaging Service) message, SNS (Social Networking System) message) from a transmission source user to a destination user.

As the message notification service, there is generally an electronic mail using a protocol such as SMTP (Simple Mail Transfer Protocol) or POP (Post Office Protocol). There is also an SMS message service that transmits and receives short text using a call connection sequence of a cellular phone network. There is also a service for transmitting and receiving messages in real time via an SNS website or application.
In these message notification systems, a user text body, a transmission source address and a destination address are transmitted and received between terminals as one message.
Each address (or account) often identifies the user himself and as long as the user is authenticated, different terminals possessed by the user can be used.

  Conventionally, when a user terminal accesses a URL (Uniform Resource Locator) for advertisement, there is a technique for receiving a unique page for each place (for each vehicle) (see, for example, Patent Document 1). According to this technique, advertisement information and a text input field (including a mail address) for the destination user are displayed on the page received by the user terminal. When a message transmission is instructed by the user, a mail describing the URL of the advertisement is transmitted to the mail address of the destination user. The destination user who has received the mail can receive the page including the advertisement information by transmitting a page request to the URL described in the mail. At this time, for each advertisement information, the server collects marketing information that indicates how much the user (at which vehicle (vehicle)) is interested and how much other users have shown interest by mail sent from the user. be able to.

  When the mail with the image file is transmitted from one terminal to the other terminal, the server stores the image file in a relay manner, and sends the mail including the image URL indicating the storage location to the second terminal. There is also a technique for transmitting to (see, for example, Patent Document 2). According to this technique, the second terminal downloads an image file from the server when the user clicks on the image URL described in the mail. Further, the second terminal can transmit a mail including the transfer destination address of the image file to the server. The server further transmits the image file toward the transfer destination address.

JP 2012-155032 A JP 2005-45630 A

  According to the e-mail, the transmission source user needs to specify “destination address” as well as “user text” (the “transmission source address” is automatically given). In this case, the transmission source terminal needs to activate e-mail software in advance or display a Web page for mail transmission / reception. Similarly, in the SMS message service, it is necessary to specify the telephone number of the destination terminal. According to the SNS message service, a message must be transmitted by entering a dedicated page for exchanging messages with a destination user.

Further, according to the technique described in Patent Document 1, the service itself is provided by a website, but the transmission source user needs to specify the mail address of the destination user.
Furthermore, according to the technique described in Patent Document 2, as in the case of general electronic mail, the transmission source terminal needs to activate mail software in advance and also needs to specify the destination address of the destination user. .

  Therefore, the present invention provides a message notification method, a server, and a program that allow a transmission source terminal to transmit a predetermined message to a destination address with a simple operation of the transmission source user without activating an application for message transmission / reception. The purpose is to provide.

According to the present invention, in the server message notification method,
The server
An address table storing addresses of the transmission source user and the destination user;
A page storage unit that stores a page of a Uniform Resource Locator (URL) that can identify the transmission source user and the destination user,
When a server receives a page request for a URL, the server uses a source address identified by the URL as a source address and a destination address as a destination address identified by the URL as a destination address. A message is transmitted.

According to another embodiment of the server message notification method of the present invention,
It is also preferable that the server transmits a predetermined message when the addresses of the transmission source user and the destination user are registered in the address table.

According to another embodiment of the server message notification method of the present invention,
The URL page is a control page in which a script for storing a cookie value in the HTTP (HyperText Transfer Protocol) cookie protocol is embedded in the browser of the transmission source terminal.
When the server receives a page request from the browser of the transmission source terminal operated by the transmission source user, the server stores the cookie value in the browser and registers the cookie value in the address table in association with the transmission source user.
It is also preferable that the server transmits the predetermined message when the cookie value included in the page request matches the cookie value based on the transmission source user in the address table.

According to another embodiment of the server message notification method of the present invention,
The server preferably stores the same cookie value in the browser of each transmission source terminal when receiving a page request from the browser of each of the plurality of transmission source terminals possessed by the same transmission source user.

According to another embodiment of the server message notification method of the present invention,
The server sends a predetermined message encrypted with the cookie value of the destination terminal,
The destination terminal also preferably decrypts the encrypted predetermined message using the cookie value stored in the browser.

According to another embodiment of the server message notification method of the present invention,
The URL can further identify the time zone,
It is also preferable that the server transmits the predetermined message when the reception time when the page request is received is included in the time zone identified by the URL.

According to another embodiment of the server message notification method of the present invention,
The URL can further identify the geographic area,
When the server receives the page request, the server further receives the transmission source location information from the transmission source terminal of the page request, and the transmission source location information is included in the geographical range identified by the URL. It is also preferable to send a predetermined message.

According to another embodiment of the server message notification method of the present invention,
The page in the page storage unit is embedded with a positioning script in the URL.
When the server receives the page request, the server preferably transmits the page to the transmission source terminal and also receives the transmission source position information acquired by executing the positioning script from the transmission source terminal.

According to another embodiment of the server message notification method of the present invention,
The URL can further identify a notification item, a telephone number, terminal information, user information, or a combination thereof,
It is also preferable that the server describes in the predetermined message any one of the notification item identified by the URL, the telephone number, the terminal information, the user information, or a combination thereof.

According to another embodiment of the server message notification method of the present invention,
The address of the destination terminal is an email address, phone number or account,
The predetermined message is
Email based on email address,
SMS (Short Message Service) push message based on phone number, or
An SNS (Social Networking Service) message based on an account is also preferable.

According to the present invention, the message notification server
An address table storing addresses of the transmission source user and the destination user;
Page storage means for storing a page of a URL capable of identifying the transmission source user and the destination user;
When a page request for a URL is received, a predetermined message is transmitted with the address based on the transmission source user identified by the URL as the transmission source address and the address based on the destination user identified by the URL as the destination address And a message transmission means.

According to the present invention, a program for causing a computer mounted on a server to function is:
An address table storing addresses of the transmission source user and the destination user;
Page storage means for storing a page of a URL capable of identifying the transmission source user and the destination user;
When a page request for a URL is received, a predetermined message is transmitted with the address based on the transmission source user identified by the URL as the transmission source address and the address based on the destination user identified by the URL as the destination address And a computer functioning as a message transmission means.

  According to the message notification method, server, and program of the present invention, a transmission source terminal can transmit a predetermined message to a destination address by a simple operation of the transmission source user without activating a message transmission / reception application. .

It is a sequence diagram in the present invention. It is explanatory drawing showing the tap operation screen of a transmission origin terminal. FIG. 6 is a sequence diagram for controlling whether or not a message can be transmitted according to a cookie value of a transmission source terminal. It is a sequence diagram which transmits the message encrypted using the cookie value of the transmission source terminal to the destination terminal. FIG. 10 is a sequence diagram for controlling whether or not a message can be transmitted according to the reception time of a page request. It is a sequence diagram which controls the propriety of the transmission of a message according to the position of a transmission source terminal. It is a sequence diagram which exchanges a message simply by URL between terminals. It is a function block diagram of the message notification server in this invention.

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

  FIG. 1 is a sequence diagram according to the present invention.

  According to FIG. 1, a message notification server 1, a transmission source terminal 2A and a destination terminal 2B are connected via a network. In addition, the transmission source user A possessing the transmission source terminal 2A intends to transmit a predetermined message to the destination user B possessing the destination terminal 2B.

  The message notification server 1 according to the present invention functions as a “Web site” for the transmission source terminal 2A that is the transmission source of the message. That is, the message notification server 1 receives the page request by publishing the URL of the Web site to the transmission source user A.

On the other hand, the message notification server 1 functions as a “transmission source terminal” of the message to the destination terminal 2B that is the destination of the message.
(1) For example, when the message is an electronic mail based on a mail address, the message notification server 1 has a mail client function and transmits the mail to an external SMTP server.
(2) Also, for example, when the message is an SMS push message based on a telephone number, the message notification server 1 has a telephone calling function, executes a call connection sequence of a mobile telephone network, and transmits a short message. To do.
(3) Furthermore, for example, when the message is an SNS message based on an account, the message notification server 1 has a log-in function for the SNS site, and notifies the message via the site.

  The message notification server 1 according to the present invention includes an address table 101 and a page storage unit 102.

[Address table 101]
The address table 101 is stored in association with user identifiers and addresses. The address corresponds to a message or mail to be transmitted to the destination terminal 2B, and is specifically a mail address, a telephone number or an account. In the case of a mail address, for example, the following address table is provided.
(Identifier) (address)
AA@aaa.com
BB@bbb.com
C --- (not registered)

[Page storage unit 102]
The page storage unit 102 stores a page of a URL that can identify the transmission source user and the destination user. This page is not limited to the one that the transmission source user browses, but is, for example, a control page described by a script.
According to FIG. 1, for example, the following URL is set.
http://www.SM.co.jp/A/B
Following this domain name, an identifier “A” indicating the transmission source user and an identifier “B” indicating the destination user are assigned to this URL, and the transmission source user and the destination user can be identified. .

[S1: First step]
(S1) A URL is displayed on the transmission source terminal 2A equipped with a touch panel display, and the transmission source user A can perform a tap operation on the URL.

  FIG. 2 is an explanatory diagram illustrating a tap operation screen of the transmission source terminal.

FIG. 2A shows the user's activation operation on the URL described in the text (for example, a message or mail received in advance) for the transmission source terminal 2A. As a result, a page request (GET Request) is transmitted toward the URL. As the mail contents, different URLs are displayed according to the notification items.
(Notification item) (URL)
"I will be late" http://www.SM.co.jp/A/B/late
"Arrived" http://www.SM.co.jp/A/B/here
"Emergency" http://www.SM.co.jp/A/B/alert
These URLs identify the page of the message notification server 1 and can identify the transmission source user A as the transmission source and the destination user B as the destination.

  FIG. 2B shows a user's activation operation on an operation button in which an HTML (HyperText Markup Language) code is displayed on the browser. This is simply a button display of a predetermined URL that is the target of the tap operation for the transmission source user A.

  Thus, according to the present invention, the transmission source user A can simply transmit a predetermined message from the message notification server 1 to the destination address by simply tapping the URL displayed on the transmission source terminal 2A. The transmission source terminal 2A does not start a message transmission / reception application and does not access a message transmission / reception website.

[S2: Second step]
(S2) The message notification server 1 identifies the transmission source user and the destination user only by receiving the URL page request. Then, it is determined whether the addresses of the transmission source user and the destination user are stored in the address table 101. If it is determined to be true, transmission of a predetermined message is instructed.

[S3: Third step]
When the addresses of the transmission source user and the destination user are stored in the address table 101, the message notification server 1 transmits a predetermined message. This message is set as follows.
Source address: Address based on the source user identified by the URL (A@aaa.com)
Destination address: Address based on the destination user identified by URL (B@bbb.com)

  As a first other embodiment, the message notification server 1 reports “message transmission completion” to the transmission source terminal 2A of the transmission source user A after transmission of the message to the destination user B is completed. Also good. Specifically, “message transmission completion” may be clearly indicated to the browser of the transmission source terminal 2A as a page response to the page request received from the transmission source terminal 2A for S2.

  Further, as the second other embodiment, the URL may be capable of further identifying any one of notification items, telephone numbers, terminal information, user information, or a combination thereof. A predetermined message describing the text content based on the identified information can be transmitted to the destination user B.

  Further, as another operational effect of the present invention, since the address of the transmission source user is given to the message received by the destination terminal 2B, the reply message can be replied as it is. For example, when the received e-mail is written and replied with its own text, the e-mail is transmitted to the transmission source user without passing through the message notification server 1 of the present invention.

  FIG. 3 is a sequence diagram for controlling whether or not a message can be transmitted according to the cookie value of the transmission source terminal.

The message notification server 1 may hold a “registration page” for allowing the user to register an address. The registration page displays an input field that allows the user who operates the terminal to describe the address. In addition, the registration page stores a “cookie value (identification value)” in the browser of the terminal when accessing the first page request from the terminal. That is, the registration page is a control page in which a script for storing a cookie value is embedded.
The “cookie value” is specifically a session identifier in the HTTP (HyperText Transfer Protocol) cookie protocol.

According to FIG. 3, the user A is going to register an address from the transmission source terminal 2 </ b> A to the message notification server 1. The transmission source terminal 2A transmits, for example, a page request with the following URL.
http://www.SM.co.jp/Reg
The message notification server 1 includes a “cookie value” stored in the browser of the transmission source terminal in the page response to the page request. The cookie value is determined uniquely by the message notification server 1. Then, the message notification server 1 registers the user address and the cookie value in the address table 101 in association with each other.

As another embodiment, when the message notification server 1 receives a page request from the browser of each of a plurality of transmission source terminals possessed by the same transmission source user, the message notification server 1 Remember the cookie value.
When the address to be registered by the user is already registered in the address table 101, the message notification server 1 stores the cookie value corresponding to the address in the browser of the transmission source terminal 2A.
Thereby, the same cookie value can be stored in browsers of different transmission source terminals of the same transmission source user.

Here, only S2 of FIG. 3 which is different from FIG. 2 will be described.
(S2) The message notification server 1 determines whether or not the cookie value included in the page request matches the cookie value based on the transmission source user in the address table. If it is determined to be true, the transmission of a predetermined message is instructed.
Thereby, the message notification server 1 accepts only a page request from the transmission source terminal 2A identified as the URL transmission source user. That is, the message notification server 1 rejects the page request of the URL received from a terminal owned by a third party other than the URL transmission source user. This is because the message notification server 1 conceals the destination address from the transmission source terminal and limits the users who can transmit the message by the URL identifier, which has the effect of increasing security.

  FIG. 4 is a sequence diagram for transmitting a message encrypted using the cookie value of the transmission source terminal to the destination terminal.

  According to FIG. 4, the message notification server 1 stores the cookie value of the destination terminal 2 </ b> B in the address table 101. At this time, the same cookie value is also stored in the browser of the destination terminal 2B.

  Here, only S3 of FIG. 4 which is different from FIG. 3 will be described.

(S31) The message notification server 1 encrypts the predetermined message to be transmitted with the cookie value stored in the destination terminal 2B. This is to maintain confidentiality when the predetermined message is text content (notification item, telephone number, terminal information, user information) based on information identified from the URL.
Then, the message notification server 1 generates a second page including the encrypted message file in the second URL. The second page is written in a markup language that can be displayed by a Web browser. Also, the second page includes a script, and when displayed on the browser, the following two processes can be automatically executed.
(A) The cookie value stored in the browser of its own terminal is acquired.
(B) Decrypt the encrypted message file using the acquired cookie value.

(S32) The message notification server 1 transmits a message in which the second URL based on the generated second page is described to the destination terminal 2B.

(S33) On the touch panel display of the destination terminal 2B, text describing that the message file is to be downloaded is displayed. Then, the destination user B is caused to perform a tap operation to activate the second URL.

(S34) The destination terminal 2B transmits a page request toward the second URL.

(S35) In response to this, the message notification server 1 sends a second page response to the destination terminal 2B.

(S36) The destination terminal 2B displays the second page on the browser, so that the script is automatically executed. Then, the destination terminal 2B acquires the cookie value stored in its own browser, and decrypts the encrypted message file using the cookie value. As a result, the predetermined message is clearly indicated to the destination terminal 2B and recognized by the user B.
According to FIG. 4, the destination user B does not need to perform any separate operation, and does not need to hold the encryption common key again between the message notification server 1 and the destination terminal 2B. .

  As another embodiment, it is also preferable that the destination terminal 2B decrypts the encrypted message file, then discards the message file, and decrypts the message file only once. It is possible to prevent the message file from being obtained by a malicious third party.

  FIG. 5 is a sequence diagram for controlling whether or not a message can be transmitted according to the reception time of the page request.

According to FIG. 5, the page storage unit 102 stores a page with a URL that can also identify the “time zone” in addition to the transmission source user and the destination user. According to FIG. 5, for example, the following URL is set.
http://www.SM.co.jp/A/B/9
Here, at the end of the URL, an identifier “9” indicating a time zone is given. Various associations between identifiers and time zones can be set. For example, identifiers “0” to “23” can be set, and may represent time units for every hour. In the case of the identifier “9”, it is assumed that 9:00 to 9:59 are set.

Here, only S2 of FIG. 5 which is different from FIG. 3 will be described.
(S2) The message notification server 1 determines whether the reception time when the page request is received is included in the time zone identified by the URL. Here, since the identifier “9” is identified, the message notification server 1 transmits a predetermined message only when a page request is received from 9:00 to 9:59. In other cases, a page response is not returned to the page request, or a page response in which “message transmission is impossible” is returned.

  FIG. 6 is a sequence diagram for controlling whether or not a message can be transmitted according to the position of the transmission source terminal.

According to FIG. 6, the page storage unit 102 stores a page of a URL that can also identify a “geographic range” in addition to the transmission source user and the destination user. According to FIG. 6, for example, the following URL is set.
http://www.SM.co.jp/A/B/XXYY
Here, at the end of the URL, an identifier “XXYY” representing a geographic range is given. Various associations between identifiers and geographic ranges can be set. For example, an identifier that can identify latitude and longitude may be set to represent a regional range that is a predetermined range (predetermined radius) around the latitude and longitude. Further, it may be a mesh code that represents the position of a geographical range divided into tiles.

  The page storage unit 102 of the message notification server 1 may store a control page in which a positioning script is embedded. The positioning script embedded in the page is a script described using Geolocation API (Application Programming Interface) in the Web application. This is a program in which the control page is voluntarily activated at the same time as being displayed on the browser of the terminal and acquires position information from the positioning unit of the terminal.

  The terminal 2 is a smartphone, for example, and generally has a positioning unit such as GPS (Global Positioning System). Such a positioning unit outputs latitude and longitude as position information in real time. Of course, it is not limited to GPS, but may be base station positioning or access point positioning.

Here, only S3 of FIG. 6 which is different from FIG. 3 will be described.
(S3) When the message notification server 1 receives a page request, the message notification server 1 responds with a page including a positioning script.
On the other hand, the transmission source terminal 2A executes a positioning script such as Geolocation API embedded in the page at the same time when the page is displayed on the browser. Then, the current position information is acquired from the positioning unit. The transmission source terminal 2A transmits the position information to the message notification server 1 by a positioning script program. The address of the message notification server 1 as a transmission destination is also specified by the positioning script.

Next, the message notification server 1 determines whether or not the transmission source position information is included in the geographic range identified by the URL. Specifically, according to FIG. 6, the latitude and longitude are identified from “XXYY” included at the end of the URL, and the location information received from the transmission source terminal 2 </ b> A is included in a predetermined area range centering on the latitude and longitude. If true, it is determined as true.
When it is determined to be true, the message notification server 1 transmits a predetermined message to the destination user B.

  FIG. 7 is a sequence diagram for simply exchanging messages between terminals using URLs.

According to S1 to S3 described above in FIG. 7, the message notification server 1 transmits a predetermined message to the destination user B when the transmission source user A taps the URL displayed on the transmission source terminal 2A. Here, in the predetermined message, a URL by which the destination user B can transmit the predetermined message to the transmission source user A is described. When the destination user B taps the URL displayed on the destination terminal 2B, a page request is transmitted toward the second URL. Then, the message notification server 1 can transmit a predetermined message to the transmission source user A.
Thus, the transmission source user A and the destination user B can exchange predetermined messages with each other by a simple operation with only a tap.

  FIG. 8 is a functional configuration diagram of the message notification server in the present invention.

  According to FIG. 8, the message notification server 1 includes an address table 101, a page storage unit 102, a page request reception unit 11, a message transmission determination unit 12, and a message transmission unit 13. These functional components are realized by executing a program that causes a computer mounted on the server to function. The processing flow of these functional components can also be understood as a message notification method.

[Page Request Receiving Unit 11]
The page request receiving unit 11 receives a page request directed to the URL from the transmission source terminal 2A. This executes the process in S1 described above in the message notification server 1.

[Message transmission determination unit 12]
The message transmission determination unit 12 instructs transmission of a predetermined message only when the address included in the page request matches the address based on the transmission source user identified by the URL. This executes the process in S2 described above in the message notification server 1.

[Message sending unit 13]
When the message transmission unit 13 receives a page request for a URL, the message transmission unit 13 uses an address based on the transmission source user identified by the URL as a transmission source address, and an address based on the destination user identified by the URL as a destination address. The predetermined message is transmitted. This executes the process in S3 described above in the message notification server 1.

As described above in detail, according to the message notification method, server, and program of the present invention, the transmission source terminal can execute the predetermined message by a simple operation of the transmission source user without activating the application for message transmission / reception. Can be sent to the destination address.
Specifically, in the case of a transmission source terminal equipped with a touch panel display, the transmission source user can transmit a predetermined message with only one tap as a user operation. At this time, the transmission source user does not need to know the address (or account) of the destination user.

  Various changes, modifications, and omissions of the above-described various embodiments of the present invention can be easily made by those skilled in the art. The above description is merely an example, and is not intended to be restrictive. The invention is limited only as defined in the following claims and the equivalents thereto.

DESCRIPTION OF SYMBOLS 1 Message notification server 101 Address table 102 Page storage part 11 Page request reception part 12 Message transmission determination part 13 Message transmission part 2 Terminal

Claims (12)

In the server message notification method,
The server
An address table storing addresses of the transmission source user and the destination user;
A page storage unit that stores a page of a Uniform Resource Locator (URL) that can identify the transmission source user and the destination user,
When the server receives a page request for the URL, the server uses the address based on the transmission source user identified by the URL as the transmission source address, and the address based on the destination user identified by the URL as the destination address. A server message notification method characterized by transmitting a predetermined message. The server message notification method according to claim 1, wherein the server transmits a predetermined message when addresses of a transmission source user and a destination user are registered in the address table. The URL page is a control page in which a script for storing a cookie value in the HTTP (HyperText Transfer Protocol) cookie protocol is embedded in the browser of the transmission source terminal.
When the server receives a page request from the browser of the transmission source terminal operated by the transmission source user, the server stores the cookie value in the browser and registers the cookie value in the address table in association with the transmission source user. And
3. The server according to claim 2, wherein the server transmits a predetermined message when the cookie value included in the page request matches the cookie value based on the transmission source user in the address table. Server message notification method. The server, when receiving a page request from a browser of each of a plurality of transmission source terminals possessed by the same transmission source user, stores the same cookie value in the browser of each transmission source terminal. Item 4. The server message notification method according to Item 3. The server sends a predetermined message encrypted with the cookie value of the destination terminal,
5. The server message notification method according to claim 3, wherein the destination terminal decrypts the encrypted predetermined message using the cookie value stored in the browser. The URL can further identify a time zone;
6. The server according to claim 1, wherein the server transmits a predetermined message when the reception time when the page request is received is included in the time zone identified by the URL. The server message notification method according to item. The URL can further identify a geographic area;
When the server receives the page request, the server further receives transmission source location information from the transmission source terminal of the page request, and the transmission source location information is included in the geographical range identified by the URL. The server message notification method according to any one of claims 1 to 6, wherein a predetermined message is transmitted. The page of the page storage unit further embeds a positioning script in the URL,
When the server receives the page request, the server transmits the page to the transmission source terminal, and receives the transmission source position information acquired by executing the positioning script from the transmission source terminal. The server message notification method according to claim 7, wherein The URL can further identify a notification item, a telephone number, terminal information, user information, or a combination thereof,
9. The server according to claim 1, wherein the server describes in the predetermined message any one of a notification item, a telephone number, terminal information, and user information identified by the URL, or a combination thereof. The server message notification method according to item. The address of the destination terminal is an email address, phone number or account,
The predetermined message is:
An email based on the email address;
SMS (Short Message Service) push message based on the phone number, or
The server message notification method according to claim 1, wherein the message notification method is an SNS (Social Networking Service) message based on the account. An address table storing addresses of the transmission source user and the destination user;
Page storage means for storing a URL (Uniform Resource Locator) page that can identify a transmission source user and a destination user;
When a page request for the URL is received, a predetermined message having an address based on the source user identified by the URL as a source address and an address based on the destination user identified by the URL as a destination address And a message transmission means for transmitting the message. An address table storing addresses of the transmission source user and the destination user;
Page storage means for storing a URL (Uniform Resource Locator) page that can identify a transmission source user and a destination user;
When a page request for the URL is received, a predetermined message having an address based on the source user identified by the URL as a source address and an address based on the destination user identified by the URL as a destination address A program for a server, which causes a computer to function as message transmission means for transmitting a message.

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