Abstract: A community server categorizes and accumulates messages exchanged by users on a virtual community for respective topics. The community server includes a subscription type setting unit, which provides, to each user and predetermined administrator, a mechanism for selecting a subscription type indicating the way each user subscribes to messages posted to the virtual community. For this purpose, the subscription type setting unit manages the subscription types of respective users for each community using a subscription type table of community management information, and changes the subscription type in the subscription table in accordance with a request from each user and administrator.

Abstract: A community server categorizes and accumulates messages exchanged by users on a virtual community for respective topics. Since the community server includes a thread moving unit, i.e., a mechanism that allows an administrator to move a thread as a set of messages posted to a given virtual community to another virtual community, each user can utilize collected and accumulated knowledge via his or her desired interface. Since the administrator can move a thread between communities, virtual communities can be combined or divided.

Abstract: There is provided a knowledge analysis system configured to be connectable to plural client terminals via network, which supports analysis requested by each of client terminals to knowledge accumulated in knowledge database, comprising: access control means for conducting user authentication to the client terminal requesting for access for permitting knowledge analysis from the client terminal; and knowledge analysis means for clustering knowledge accumulated in the knowledge database to create cluster database in which each of the knowledge is classified into clusters defined based on category; wherein the knowledge analysis means has means for setting important words having priority in clustering at creation of the cluster database, and carries out clustering to create an axis of cluster on the basis of the important words.

Abstract: A community server categorizes and accumulates messages exchanged by users on a virtual community for respective topics. The community server includes a user access limiting control unit. The user access limiting control unit determines user's access authority of each client terminal for each community as an access destination. For this purpose, the user access limiting control unit manages a community type indicating the open level of each community, and a member type indicating the participation attribute of each user to the virtual community, using community management information, and limits access to a community as an access destination for each client terminal on the basis of the combination of the community type and member type.

Abstract: There is provided a knowledge analysis system configured to be connectable to plural client terminals via network, which supports analysis requested by each of client terminals to knowledge accumulated in knowledge database, comprising: access control means for conducting user authentication to the client terminal requesting for access for permitting knowledge analysis from the client terminal; and knowledge analysis means for clustering knowledge accumulated in the knowledge database to create cluster database in which each of the knowledge is classified into clusters defined based on category; wherein the knowledge analysis means has means for setting important words having priority in clustering at creation of the cluster database, and carries out clustering to create an axis of cluster on the basis of the important words.

Abstract: A community server categorizes and accumulates messages exchanged by users on a virtual community for respective topics. Since the community server includes a thread moving unit, i.e., a mechanism that allows an administrator to move a thread as a set of messages posted to a given virtual community to another virtual community, each user can utilize collected and accumulated knowledge via his or her desired interface. Since the administrator can move a thread between communities, virtual communities can be combined or divided.

Abstract: A community server categorizes and accumulates messages exchanged by users on a virtual community for respective topics. The community server includes a subscription type setting unit, which provides, to each user and predetermined administrator, a mechanism for selecting a subscription type indicating the way each user subscribes to messages posted to the virtual community. For this purpose, the subscription type setting unit manages the subscription types of respective users for each community using a subscription type table of community management information, and changes the subscription type in the subscription table in accordance with a request from each user and administrator.