A presence service providing system and method is disclosed that provides presence information regarding presentities to watchers. The presence system sets mapping information, which contains the presence information that matches position information corresponding to at least one presentity. When the position information is received via a positioning system, the presence system detects the presence information, which matches the received position information, from the set mapping information. The detected presence information is transmitted from the presence system to a watcher. The presence service providing system can provide a variety of presence information according to the location of the presentity, so that watchers can more specifically and clearly identify the states of the presentity from the presence information.