Patent ID: 7796739
Filing Date: 2010-09-14
Classification: H04L

Abstract:
1. A presence management system comprising: a plurality of terminal devices which may be set as any of presentities and watchers; and a server unit which manages the presence of the terminal devices, wherein the server unit includes: a database configured to store a relationship table in which parameters showing relationships to each watcher for each presentity in a table form; a reading module configured to read each of the parameters of the watchers for presentities of their change sources from the database when detecting changes in presence of the presentities; a parameter notifying module configured to notify the read parameters to each watcher for the presentities of the change sources; and a module configured to notify the presences of the presentities to the watchers of request sources in response to acquisition requests; and the plurality of terminal devices includes: a calculation processing module configured to substitute the parameters into a calculation formula in which watchers, having relationships closer to the presentities of the change sources, have priorities in temporal order to calculate acquisition timing when the parameters have been notified; and an acquisition processing module configured to transmit the acquisition requests to the server unit at the calculated acquisition timing.