Abstract:
The present invention discloses a method, a system, and an advertisement server for disseminating advertisements by means of presence information, so as to solve the problem that the advertisement dissemination by means of a presence system can not be recorded effectively in the prior art. The method disclosed in the present invention comprises: subscribing to, by the watcher, the presence information of the presentity; publishing, by the presentity, the presence information with advertisement information and presentity ID to the presence server; notifying, by the presence server, the watcher of the presence information with presentity ID; sending, by the watcher, the presentity ID to the advertisement server; and, recording, by the advertisement server, the presentity ID. Because the advertisement server records the presentity ID, it knows how the watcher obtains the advertisement, and thereby can record the advertisement dissemination effectively.

Description:
CROSS-REFERENCE TO RELATED APPLICATIONS 
       [0001]    This application claims priority from Chinese Patent Application No. 200710079850.5, filed on Feb. 15, 2007, entitled “Method, System, and Server for Disseminating Advertisements by Presence Information”, the content of which is incorporated herein by reference in its entirety. 
       FIELD OF THE INVENTION 
       [0002]    The disclosure relates to communication field, particularly to presence information communication service field. 
       BACKGROUND OF THE INVENTION 
       [0003]    The presence service is a communication service for collecting and publishing presence information. Many users expect to obtain other&#39;s presence information from the presence service, such as users&#39; family members and friends. 
         [0004]    In the technical solution of an existing presence information system, as shown in  FIG. 1 , a presence information system mainly consists of a presentity client or application, a presence server, a watcher client, a presence Extensible Markup Language (XML) Document Management System (presence XDMS). 
         [0005]    The presentity client or application is a source of presence information, which may publish the presence information to a presence server actively when its presence information changes. After the published presence information is processed (including composed, authorized and filted, etc.), the presence server notifies the processed presence information to all watcher clients that have subscribed to this user presence information. 
         [0006]    The presence server is adapted to receive a Subscribe message from a watcher client, determine the subscription result according to filtering rules preset by the subscribed presentity, receive the presence information published by the presentity, process the presence information with some filtering rules (content authorization, filtering,) preset by the presentity/watcher, and finally publish the presence information to a watcher client via Notify message. 
         [0007]    The watcher client subscribes to the presence information of the presentity and receives the presence information of the presentity published by the presence server. 
         [0008]    The presence XDMS stores authorization rules and group information of presentity, the authorization rules include subscription authorization rules, content authorization rules, etc. 
         [0009]    It should be noted that the presence information is subscribed to and published via SIP (Session Initiation Protocol) messages. The SIP message header of the published information contains a component flag of the presentity, and the message body contains an XML (Extensible Markup Language) document, which is the presence information of the presentity. 
         [0010]    In the existing system, one of the most important means is a “presence information composing and publishing unit”. The structure of the presence information composing and publishing unit is shown in  FIG. 2 , including: 
         [0011]    a presence information composing unit, adapted to compose newly published presence information and presence information stored in the server; 
         [0012]    a content authorization rule checking unit, adapted to filter out the presence information that is not permitted to be published according to the rules (what presence information is permitted to be published) set by the presentity; 
         [0013]    a watcher filtering unit, adapted to filter out the information that is not expected to be received (for example, the watcher only wants to receive a notification when the user terminal changes from OFF state to ON state, and other presence information will be filtered out), according to the filtering rules (what information is not expected to be received) set by the watcher; 
         [0014]    a partial notification processing unit, adapted to filter out the information beyond the subscription scope, according to the filtering rules set by the watcher when the watcher performs subscription (for example, only the presence information relevant to the user&#39;s location will be received); 
         [0015]    a presence information publishing unit, adapted to notify the watcher of the presence information that has been processed. 
         [0016]    The processing procedure of the existing presence system is shown in  FIG. 3 , including the following steps. 
         [0017]    The presentity sets some filtering rules (such as subscription authorization rules and content authorization rules) in the presence server in advance. 
         [0018]    The watcher subscribes to the presence information of the presentity from the presence server. 
         [0019]    The presentity publishes the presence information to the presence server. 
         [0020]    The presence server notifies the watcher of the presence information of the presentity. 
         [0021]    There are many ways to disseminate mobile advertisements today. In the process of implementing the present invention, the inventor found, via studying, that the related art only supports publishing advertisements by presence information but can not record the dissemination of advertisements effectively. As a result, the advertisement server can not know how the user obtained the advertisement. However, such information is important metrical information for dissemination of advertisements. In addition, in the related art, the advertisement server can not set an effective strategy for distribution of advertisements and disseminate advertisements according to the presence information of the presentity client. 
       SUMMARY OF THE INVENTION 
       [0022]    An embodiment of the present invention provides a method and a system for disseminating advertisements by presence information, which can utilize a presence system to record dissemination of advertisements effectively. 
         [0023]    The present invention provides a method for disseminating advertisements by means of presence information, including the following steps: 
         [0024]    subscribing to, by a watcher, the presence information of a presentity; 
         [0025]    publishing, by the presentity, the presence information with advertisement information and a presentity ID to a presence server; 
         [0026]    notifying, by the presence server, the watcher of the presence information with the presentity ID; and 
         [0027]    sending, by the watcher, the presentity ID to an advertisement server; recording, by the advertisement server, the presentity ID. 
         [0028]    In addition, an embodiment of the present invention further provides a system for disseminating advertisements by means of presence information, including: 
         [0029]    a first subscribing unit, which is arranged in a watcher, adapted to enable the watcher to subscribe to the presence information of a presentity; 
         [0030]    a publishing unit, which is arranged in the presentity, adapted to enable the presentity to publish the presence information with advertisement information and a presentity ID to a presence server; 
         [0031]    a notifying unit, which is arranged in the presence server, adapted to enable the presence server to notify the watcher of the presence information with the presentity ID; 
         [0032]    a sending unit, which is arranged in the watcher, adapted to enable the watcher to send the presentity ID to an advertisement server; and 
         [0033]    a recording unit, which is arranged in the advertisement server, adapted to record the presentity ID sent from the watcher to the advertisement server. 
         [0034]    It can be seen from above technical solutions that, during advertisement dissemination, the advertisement server records the presentity ID or the advertisement server matches the presentity ID sent from the watcher client to the presentity ID notified by the presence server and records the result of matching, thereby, the advertisement server is able to know how the watcher client obtained the advertisement; in addition, the advertisement server may obtain the presence information of the presentity client. Therefore the advertisement server may set effective advertisement sending strategy and disseminate advertisements. 
     
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
         [0035]      FIG. 1  is a schematic diagram illustrating the structure of a presence system in the related art; 
           [0036]      FIG. 2  is a detailed schematic diagram of the presence information composing and publishing unit in the related art; 
           [0037]      FIG. 3  is an interaction flow diagram of the presence system in the related art; 
           [0038]      FIG. 4  is a flow diagram of a method in the first embodiment; 
           [0039]      FIG. 5  is a flow diagram of a method in the second embodiment; 
           [0040]      FIG. 6  is a flow diagram of a method in the third embodiment; 
           [0041]      FIG. 7  is a flow diagram of a method in the fourth embodiment; 
           [0042]      FIG. 8  is a schematic diagram illustrating the structure of the fifth embodiment; 
           [0043]      FIG. 9  is a schematic diagram illustrating the structure of the sixth embodiment; 
           [0044]      FIG. 10  is a schematic diagram illustrating the structure of the seventh embodiment; and 
           [0045]      FIG. 11  is a schematic diagram illustrating the structure of the eighth embodiment. 
       
    
    
     DETAILED DESCRIPTION OF THE EMBODIMENTS 
       [0046]    A method for disseminating advertisements by presence information is provided in the first embodiment of the present invention. The procedure of the method in the first embodiment is shown in  FIG. 4 , including the following steps. 
         [0047]    Step  100 : An advertisement server subscribes to presence information of a presentity and sets filtering rules. 
         [0048]    Step  101 : A watcher subscribes to the presence information of the presentity and sets filtering rules which include information of advertisement type, such as sports advertisements, culture and art advertisements. 
         [0049]    Step  102 : When playing an advertisement, the presentity can recognize that the content belongs to advertisement according to the format of the content, and change the presence information while the advertisement is played. 
         [0050]    Step  103 : The presentity publishes to a presence server the presence information together with a URL of the advertisement content and a unique presentity ID that is distinguished from those of other presentities. 
         [0051]    Step  104 : According to the filtering rules set by the watcher, the presence server notifies the watcher of the presence information that meets the rules, with a URL of advertisement content and a unique ID of the presentity contained in the notified presence information. 
         [0052]    Step  105 : According to the filtering rules set by the advertisement server, the presence server notifies the advertisement server of the presence information that meets the rules, with the unique ID of the presentity contained in the notified presence information; of course, to ensure the presence information can be identified more accurately in subsequent steps, the URL of advertisement content may also be included in the presence information. When determining that the request initiated from the watcher is a subscription refreshing request, the presence server will no longer notify the advertisement server of the presence information. 
         [0053]    Step  106 : The watcher obtains the URL of advertisement content from the notified presence information and obtains the advertisement content via the URL from the advertisement server, carrying the unique ID; in that way, the advertisement server knows how the watcher obtains the advertisement and records the presentity ID. 
         [0054]    Step  107 : The advertisement server judges whether the presentity ID sent from the watcher matches the presentity ID notified by the presence server; if the two IDs are identical, step  108  will be processed; otherwise step  111  will be processed. 
         [0055]    Step  108 : The advertisement server records a result that represents matching. 
         [0056]    Step  109 : The advertisement server judges whether it is the first time that the watcher obtains the advertisement content; if it is, the advertisement server deems that the presentity has disseminated the advertisement content successfully and executes step  110 ; otherwise the advertisement server executes step  111  directly. 
         [0057]    Step  110 : The advertisement server sends an SIP message to the presentity to notify the presentity that the advertisement has been disseminated successfully; or, the advertisement server sends the SIP message to the presence server to notify the presence server that the presentity has disseminated the advertisement successfully and that the disseminating object is the watcher; of course, the advertisement server may send the SIP message to both the presentity and the presence server. 
         [0058]    Step  111 : The advertisement server returns the advertisement content to the watcher. 
         [0059]    Step  112 : The watcher plays the advertisement and continues to disseminate advertisement. 
         [0060]    A method for disseminating advertisements by means of presence information is provided in the second embodiment of the present invention. Different from the first embodiment, in the second embodiment, only after the watcher plays the advertisement and feeds back the information indicating that the advertisement has been played to the advertisement server, the advertisement server judges whether the presentity has disseminated an advertisement successfully. The procedure of the second embodiment is shown in  FIG. 5 , in which the preceding steps  200 - 206  are identical to the steps  100 - 106  in the first embodiment, but the method further includes: 
         [0061]    Step  207 : The advertisement server returns the advertisement content to the watcher. 
         [0062]    Step  208 : The watcher plays the advertisement and continues to disseminate advertisement. 
         [0063]    Step  209 : When playing the advertisement, the watcher notifies the advertisement server of the advertisement content that is being played. 
         [0064]    Step  210 : The advertisement server judges whether the ID sent by the watcher matches the ID notified by the presence server and records the result that represents matching; furthermore, the advertisement server judges whether it is the first time that the watcher obtains the advertisement content; if the two IDs match to each other and it is the first time that the watcher obtains the advertisement content, the advertisement server deems that the presentity has disseminated the advertisement content successfully and sends an SIP message to notify the presentity and/or the presence server. 
         [0065]    A method for disseminating advertisements by means of presence information is provided in the third embodiment of the present invention. The procedure of the third embodiment is shown in  FIG. 6 , including the following steps. 
         [0066]    Step  300 : The presentity subscribes to advertisement service. The advertisement server serves as a watcher and subscribes to the presence information of the presentity from the presence server. The advertisement server sets filtering rules (e.g., only receive presence information related to advertisements) according to the service information subscribed to by the user. 
         [0067]    Step  301 : The presentity changes the presence information and publishes the presence information to the presence server. 
         [0068]    Step  302 : The presence server determines whether to notify the advertisement server of the presence information of the presentity according to the filtering rules (i.e., only receive presence information related to advertisements) set by the advertisement server when the advertisement server subscribes to the presence information of the presentity; if the conditions are met, the presence server will notify the advertisement server of the presence information of the presentity. 
         [0069]    Step  303 : The advertisement server presets sending rules to determine whether to send an advertisement. For example, the advertisement server determines to send an advertisement to the presentity if the sending frequency does not exceed a preset limit and the presentity is in disengagement time. 
         [0070]    Step  304 : When determining it is appropriate to send an advertisement, the advertisement server will choose the advertisement that meets the preset sending rules according to the categorizing rules (such as a sports advertisement, a culture and art advertisement) and the presence information (such as off-duty and rest), and send the advertisement to the presentity. For example, the advertisement server accesses a shared XDMS to obtain user profile and user preference of the presentity, and then chooses an appropriate advertisement to send to the presentity according to the user profile, user preference, and history advertisement sending record. 
         [0071]    Step  305 : The advertisement server directly pushes the advertisement content to the presentity, or, the advertisement server may send an SIP message to the presentity, with the advertisement content or advertisement URL contained in the SIP message, so that the presentity may obtain the advertisement content from the advertisement server. 
         [0072]    When the presentity plays the advertisements subsequently, the corresponding steps in the first embodiment or the second embodiment can be executed. 
         [0073]    A method for disseminating advertisements by means of presence information is provided in the fourth embodiment of the present invention. The procedure of the fourth embodiment is shown in  FIG. 7 . 
         [0074]    Suppose that user John and user Ken work in the same company and have a common interest in sports. Ad-Anywhere is an advertisement company which inserts advertisements in different services as demanded by the users and provides payment accordingly. The company has entered into an agreement with Operator C to provide preferential service to the users on the basis of the amount of advertisements watched or disseminated by the users, for example, the company provides other free services to the users, such as weather forecast service or reimbursement of charge. Both John and Ken have subscribed to the advertisement service of Ad-Anywhere and have customized their expected advertisement contents, which may be advertisements on sports products or sports events. 
         [0075]    Step  400 : Now, Ad-Anywhere has developed a new service, which utilizes presence information to disseminate advertisements. The company subscribes to the presence information of John and Ken from the presence server, and filters out presence information that is not suitable for disseminating advertisements or irrelevant to advertisements. Ken has also subscribed to the presence information of John. 
         [0076]    Step  401 : John is strolling along the street on the weekend, and his presence information is “Strolling Along The Street”. The advertisement server of Ad-Anywhere obtains the information via the presence server and knows that John can receive advertisements in that state, and, furthermore, Ad-Anywhere finds that John agreed to receive up to 3 advertisements per day, but no advertisement has been sent to John today. Then, Ad-Anywhere determines to send an advertisement to John. 
         [0077]    Step  402 : The advertisement server obtains the user profile and user preference of John from the shared XDMS and finds the newly created NIKE New Product advertisement is very suitable for John; then, the advertisement server sends the advertisement address http://www.ad-anywhere.com/content/nike20070105.rm in an SIP message to John. 
         [0078]    Step  403 : John obtains the advertisement and begins to play the advertisement; John&#39;s client identifies that the content is advertisement by the format, and therefore notifies PUA (Presence User Agent) to change the presence information to “Watching Advertisement” state, and publishes the presence information to the presence server. The message format is: 
         [0000]    
       
         
               
               
             
           
               
                   
                   
               
             
             
               
                   
                   Publish sip:presentity@example.com SIP/2.0 
               
               
                   
                   Via: SIP/2.0/UDP pua.example.com;branch=z9hG4bK652hsge 
               
               
                   
                   To: &lt;sip:presentity@example.com&gt; 
               
               
                   
                   From: &lt;sip:presentity@example.com&gt;;tag=1234wxyz 
               
               
                   
                   Call-ID: 81818181@pua.example.com 
               
               
                   
                   CSeq: 1 Publish 
               
               
                   
                   Max-Forwards: 70 
               
               
                   
                   Expires: 3600 
               
               
                   
                   Event: presence 
               
               
                   
                   Content-Type: application/pidf+xml 
               
               
                   
                   Content-Length: ... 
               
               
                   
                 &lt;?xml version=“1.0” encoding=“UTF-8”?&gt; 
               
               
                   
                 &lt;presence xmlns=“urn:ietf:params:xml:ns:pidf” 
               
               
                   
                  xmlns:op=“urn:oma:xml:prs:pidf:oma-pres” 
               
               
                   
                  entity=“sip:someone@example.com”&gt; 
               
               
                   
                  &lt;pdm:person id=“a1233”&gt; 
               
               
                   
                   &lt;activities&gt; 
               
               
                   
                     &lt;ad URL=”http://www.ad- 
               
               
                   
                     anywhere.com/content/nike20070105.rm”/&gt; 
               
               
                   
                   &lt;activities&gt; 
               
               
                   
                   &lt;pdm:timestamp&gt;2005-02-23T12:14:56Z&lt;/pdm:timestamp&gt; 
               
               
                   
                  &lt;/pdm:person&gt; 
               
               
                   
                 &lt;/presence&gt; 
               
               
                   
                   
               
             
          
         
       
     
         [0079]    Step  404 : The presence server judges whether the advertisement meets the filtering rules preset by Ken. The presence server detects from the presence information that the advertisement belongs to an advertisement of sports products, which matches the filtering rule “only sports advertisement” set by Ken completely; therefore, the presence server notifies Ken of the presence information with the URL and John&#39;s ID. The message format is: 
         [0000]    
       
         
               
               
             
           
               
                   
                   
               
             
             
               
                   
                    Notify sip:user@watcherhost.example.com SIP/2.0 
               
               
                   
                   Via: SIP/2.0/TCP server.example.com;branch=z9hG4bKna998sk 
               
               
                   
                   From: &lt;sip:presentity@example.com&gt;;tag=ffd2 
               
               
                   
                   To: &lt;sip:user@example.com&gt;;tag=xfg9 
               
               
                   
                   Call-ID: 2010@watcherhost.example.com 
               
               
                   
                   Event: presence 
               
               
                   
                   Subscription-State: active;expires=599 
               
               
                   
                   Max-Forwards: 70 
               
               
                   
                   CSeq: 8775 Notify 
               
               
                   
                   Contact: sip:server.example.com 
               
               
                   
                   Content-Type: application/pidf+xml 
               
               
                   
                   Content-Length: ... 
               
               
                   
                 &lt;?xml version=“1.0” encoding=“UTF-8”?&gt; 
               
               
                   
                 &lt;presence xmlns=“urn:ietf:params:xml:ns:pidf” 
               
               
                   
                  xmlns:op=“urn:oma:xml:prs:pidf:oma-pres” 
               
               
                   
                  entity=“sip:someone@example.com”&gt; 
               
               
                   
                  &lt;pdm:person id=“a1233”&gt; 
               
               
                   
                   &lt;activities&gt; 
               
               
                   
                     &lt;ad URL=”http://www.ad- 
               
               
                   
                     anywhere.com/content/nike20070105.rm”/&gt; 
               
               
                   
                   &lt;activities&gt; 
               
               
                   
                   &lt;pdm:timestamp&gt;2005-02-23T12:14:56Z&lt;/pdm:timestamp&gt; 
               
               
                   
                  &lt;/pdm:person&gt; 
               
               
                   
                 &lt;/presence&gt; 
               
               
                   
                   
               
             
          
         
       
     
         [0080]    Step  405 : When notifying Ken of the presence information, the presence server finds that the presence information contains an advertisement identification that indicates the presence information belongs to advertisement, and thereby notifies the advertisement server of the presence information at the same time. 
         [0081]    Step  406 : Ken receives the presence information, obtains the advertisement content from the advertisement server, and reports John&#39;s ID to the advertisement server. 
         [0082]    Step  407 : The advertisement server receives the request from Ken, and determines that the ID in the request is identical to the ID carried with the presence information notified by the presence server last time and it is the first time that Ken requests such advertisement content, thereby, the advertisement server records that the advertisement content has been disseminated once by John and the receiver also requests to access the advertisement object. 
         [0083]    Step  408 : The advertisement server sends an SIP message to John to tell John that the advertisement disseminated to Ken has positive effect; in addition, the reward information for John may be included in the SIP message. 
         [0084]    Step  409 : The advertisement server returns the content to Ken; Ken begins to watch the advertisement and further disseminates the advertisement to his friends. 
         [0085]    An alternative process is as follows. 
         [0086]    When watching the advertisement, Ken sends an SIP message to the advertisement server to notify the advertisement server that he is watching the advertisement and the advertisement content identifier. 
         [0087]    The advertisement server detects that the advertisement content was disseminated from John to Ken, and then notifies John that the advertisement disseminated by him has been watched by Ken. 
         [0088]    A system  800  for disseminating advertisements by means of presence information is provided in the fifth embodiment of the present invention. The structure of the system is shown in  FIG. 8 , and the system includes: 
         [0089]    a first subscribing unit  8041 , which is arranged in a watcher  804 , adapted to enable the watcher  804  to subscribe to the presence information of a presentity  801 ; 
         [0090]    a publishing unit  8011 , which is arranged in the presentity  801 , adapted to enable the presentity  801  to publish the presence information with advertisement information and a presentity ID to a presence server  802 ; 
         [0091]    a notifying unit  8021 , which is arranged in the presence server  802 , adapted to enable the presence server  802  to notify the watcher  804  of the presence information with the presentity ID; 
         [0092]    a sending unit  8042 , which is arranged in the watcher  804 , adapted to enable the watcher  804  to send the presentity ID to an advertisement server  803 ; and 
         [0093]    a recording unit  8033 , which is arranged in the advertisement server  803 , adapted to record the presentity ID sent from the watcher  804  to the advertisement server  803 . 
         [0094]    The system further includes: 
         [0095]    a second subscribing unit  8031 , which is arranged in an advertisement server  803 , adapted to enable the advertisement server  803  to subscribe to the presence information of the presentity  801 ; 
         [0096]    the notifying unit  8021 , further adapted to enable the presence server  802  to notify the advertisement server  803  of the presence information with the presentity ID; and 
         [0097]    a matching unit  8032 , which is arranged in the advertisement server  803 , adapted to enable the advertisement server  803  to match a presentity ID sent from the watcher  804  to a presentity ID notified by the presence server  802 , and record a result. 
         [0098]    The system further includes: 
         [0099]    a playback unit (not shown), which is arranged in the watcher  804 , adapted to play the advertisement content after the advertisement server  802  matches the presentity ID sent from the watcher  804  to the presentity ID notified by the presence server  802  and records the result. 
         [0100]    The system further includes: 
         [0101]    a playback notifying unit (not shown), which is arranged in the watcher  804 , adapted to play the advertisement content and notify the advertisement server  802  of a message to indicate that the watcher  804  has played the advertisement, between the step in which the watcher  804  sends the presentity ID to the advertisement server  802  and the advertisement server  803  records the presentity ID and the step in which the advertisement server  803  matches the presentity ID sent from the watcher  804  to the presentity ID notified by the presence server  802  and records the result. 
         [0102]    The system further includes: 
         [0103]    a feedback message sending unit (not shown), which is arranged in the advertisement server  803 , adapted to enable the advertisement server  803  to send a feedback message to the presentity and/or the presence server  802 . 
         [0104]    The system further includes: 
         [0105]    an advertisement sending unit, which is arranged in the advertisement server  803 , adapted to enable the advertisement server  803  to choose the advertisement that meets preset sending rules according to categorizing rules and the presence information and send the advertisement to the presentity  801 ; 
         [0106]    the publishing unit  8011 , further adapted to enable the presentity  801  to publish presence information to the presence server  802 ; and 
         [0107]    the notifying unit  8021 , further adapted to enable the presence server  802  to notify the advertisement server  803  of the presence information that meets filtering rules preset by the advertisement server  803 . 
         [0108]    A system for disseminating advertisements by means of presence information is provided in the embodiment 6 of the present invention. The structure of the system is shown in  FIG. 9 , and the system includes: 
         [0109]    a second subscribing unit  9031 , which is arranged in an advertisement server  903 , adapted to enable the advertisement server  903  to subscribe to the presence information of a presentity  901 ; 
         [0110]    an advertisement sending unit  9032 , which is arranged in the advertisement server  903 , adapted to enable the advertisement server  903  to choose the advertisement that meets preset sending rules according to categorizing rules and the presence information and send the advertisement to the presentity  901 ; 
         [0111]    a publishing unit  9011 , which is arranged in the presentity  901 , adapted to enable the presentity  901  to publish the presence information to a presence server  902 ; and 
         [0112]    a notifying unit  9021 , which is arranged in the presence server  902 , adapted to enable the presence server  802  to notify the advertisement server  903  of the presence information that meets filtering rules preset by the advertisement server  903 . 
         [0113]    An advertisement server for disseminating advertisements by means of presence information is provided in the seventh embodiment of the present invention. The structure of the advertisement server is shown in  FIG. 10  and the advertisement server includes: 
         [0114]    a second subscribing unit  1011 , adapted to enable an advertisement server to subscribe to the presence information of a presentity; 
         [0115]    a matching unit  1013 , adapted to enable the advertisement server to match a presentity ID sent from a watcher to a presentity ID notified by a presence server, and record a result; and 
         [0116]    a recording unit  1012 , adapted to record the presentity ID sent from the watcher to the advertisement server. 
         [0117]    The advertisement server further includes: 
         [0118]    a feedback message sending unit, adapted to enable the advertisement server to send a feedback message to the presentity and/or the presence server. 
         [0119]    The advertisement server further includes: 
         [0120]    an advertisement sending unit, adapted to enable the advertisement server to choose the advertisement that meets preset sending rules according to categorizing rules and the presence information and send the advertisement to the presentity. 
         [0121]    An advertisement server for disseminating advertisements by means of presence information is provided in the eighth embodiment of the present invention. The structure of the advertisement server is shown in  FIG. 11  and the advertisement server includes: 
         [0122]    a second subscribing unit  1111 , adapted to enable an advertisement server to subscribe to the presence information of a presentity; and 
         [0123]    an advertisement sending unit  1112 , adapted to enable the advertisement server to choose the advertisement that meets preset sending rules according to categorizing rules and the presence information and send the advertisement to the presentity. 
         [0124]    The systems and advertisement servers for disseminating advertisements by means of presence information illustrated in the fifth embodiment to the eighth embodiment of the present invention can be implemented with the forementioned technical schemes in the prior art, and therefore will not be described further here. 
         [0125]    Apparently, those skilled in the art may make a variety of modifications and alternations to the present invention, without departing from the spirit and scope of the present invention. If such modifications or alternations fall into the scope defined in the claims or any equivalent technical scope, the present invention intends to cover them.