Abstract: A computer system has a presence server having a presence management unit that carries out a processing associated with presence data; and a conference management server that carries out a control processing of a conference. Then, when a request of an image delivery to another participant of a voice-based teleconference is received from a terminal of a first participant of the voice-based teleconference, the conference management server secures a resource for the image delivery, and transmits a presence setting request to the presence server so that the first participant and another participant can subscribe data concerning the resource for the image delivery. In addition, in response to the presence setting request, the presence management unit of the presence server carries out a setting so that the first participant and another participant can subscribe the data concerning the resource for the image delivery as presence data, which is delivered to subscribers when updated.

Abstract: The object is to enable suppression of an excessive number of changes in assignment of a server in charge of communication in response to movement of a terminal. A position-information acquisition unit in a computer acquires information on the position of a mobile terminal as a candidate for a destination of information provision. Then, a zone determination unit determines whether or not the mobile terminal is in a coverage zone or a margin zone on the basis of the information on the position. An information provision unit starts the information provision to the mobile terminal when the mobile terminal enters the coverage zone, and ends the information provision to the mobile terminal when the mobile terminal goes out of the margin zone.

Abstract: A computer system has a presence server having a presence management unit that carries out a processing associated with presence data; and a conference management server that carries out a control processing of a conference. Then, when a request of an image delivery to another participant of a voice-based teleconference is received from a terminal of a first participant of the voice-based teleconference, the conference management server secures a resource for the image delivery, and transmits a presence setting request to the presence server so that the first participant and another participant can subscribe data concerning the resource for the image delivery. In addition, in response to the presence setting request, the presence management unit of the presence server carries out a setting so that the first participant and another participant can subscribe the data concerning the resource for the image delivery as presence data, which is delivered to subscribers when updated.

Abstract: This invention is to enable transfer of a right to speak in an audio teleconference in view of usability. In this invention, a PoC server is introduced to achieve new functions, such as transfer of the right to speak, reservation to acquire the right to speak, and deprivation of the right to speak. The PoC server has a teleconference presence manager, a teleconference manager, and a teleconference audio communication manager. The right to speak is managed in a presence data storage of the teleconference presence manager. The teleconference presence manager directly manages the presence data storage, but the teleconference manager manages transfer of the right to speak. In addition, the teleconference manager manages reservation of the right to speak by a storage for a reservation list of the right to speak. The teleconference audio communication manager carries out routing of audio data. At that time, only audio data received from a user holding the right to speak is transferred.

Abstract: A communication control method of this invention includes: when a call-in request to a chat for another participant in a voice-based teleconference by a first participant of the voice-based teleconference is received, transmitting the call-in request to the chat to a terminal of another participant; and when a participation response to the chat by another participant is received, carrying out a presence management setting so as to enable the first participant and a participant replying the participation response to update and subscribe dialogue contents of the chat, which are managed as presence data delivered to subscribers when updated. Thus, by using the presence technique, it becomes possible that the conference is shifted from the voice-based teleconference to the character-based teleconference and both of the conferences coexist.

Abstract: The presence information delivery system according to this invention manages, for each user, data of one or plural presence group so as to associate one or plural presence information items for the presence information to be delivered with an ID or IDs of one or plural delivery destination user of the presence information relating to the presence information item. With this configuration, by generating a new presence group associating the presence information item with the delivery destination user, by registering the presence information item to another presence group, and by registering the delivery destination user into another presence group, the flexible information delivery is enabled according to characteristics or the like of the delivery destination user and presence information.

Abstract: The object is to enable suppression of an excessive number of changes in assignment of a server in charge of communication in response to movement of a terminal. A position-information acquisition unit in a computer acquires information on the position of a mobile terminal as a candidate for a destination of information provision. Then, a zone determination unit determines whether or not the mobile terminal is in a coverage zone or a margin zone on the basis of the information on the position. An information provision unit starts the information provision to the mobile terminal when the mobile terminal enters the coverage zone, and ends the information provision to the mobile terminal when the mobile terminal goes out of the margin zone.

Abstract: This invention is to enable transfer of a right to speak in an audio teleconference in view of usability. In this invention, a PoC server is introduced to achieve new functions, such as transfer of the right to speak, reservation to acquire the right to speak, and deprivation of the right to speak. The PoC server has a teleconference presence manager, a teleconference manager, and a teleconference audio communication manager. The right to speak is managed in a presence data storage of the teleconference presence manager. The teleconference presence manager directly manages the presence data storage, but the teleconference manager manages transfer of the right to speak. In addition, the teleconference manager manages reservation of the right to speak by a storage for a reservation list of the right to speak. The teleconference audio communication manager carries out routing of audio data. At that time, only audio data received from a user holding the right to speak is transferred.