Patent ID: 7945679

Claim:
A presence service system, comprising at least two terminals connected via a network to each other for communicating presence information therebetween, wherein each terminal applies a presence notification policy registered corresponding to a condition regarding presence information; and wherein each of the terminals comprises: presence information keeping means for keeping therein the presence information of the transmission-side terminal; presence notification policy keeping means for keeping therein the condition and the presence notification policy registered corresponding to the condition; presence notification policy setting means for acquiring the presence information of the transmission-side terminal from the presence information keeping means and determining whether or not the presence information satisfies the condition kept in the presence information keeping means; presence information notifying means for receiving, if the presence information satisfies the condition, the presence notification policy registered corresponding to the condition from the presence notification policy setting means; and reception-side terminal list keeping means for registering a reception-side terminal having issued a subscribe request, the presence information notifying means notifying, if the presence information satisfies the condition, the presence information obtained from the presence notification policy keeping means to the reception-side terminal registered to the reception-side terminal list keeping means, according to the presence notification policy received from the presence notification policy setting means.