| 摘要 |
A presentity service client (101,203) has a presentity that issues presence information to a presence service (103,209) and a watcher (107,202,213,226) which observes presence information for other presentities; a presence change rule holding part (105,205) holds a presence change rule; and a presence calculating part (104,204) changes the presence information for the presentity, using as a trigger a change in presence information of other presentities, based on the presence information of other presentity acquired by the watcher (107,202,213,226) and in accordance with the presence change rule held by a presence change rules holding part (105,205).
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