Presence management system, presence notification method, server unit, and terminal device

摘要

According to one embodiment, a presence management system comprises a server unit and a plurality of terminal devices. The server unit controls a plurality of presentities and a plurality of watchers. The terminal devices may be set to any of the presentities and the watchers for other terminal devices. The server unit includes a database, a reading module and a notification processing module. The database stores a relationship table in which parameters showing relationships to each watcher for each presentity in a table form. The reading module reads each of the parameters of the watchers for presentities of their change sources from the database when changes in presence of the presentities working under the server unit. The notification processing module notifies the presences of the presentities to each watcher for the presentities of the change sources at timing in accordance with the read parameters.