A presence management apparatus connected to first and second apparatuses
via a network includes a unit for updating a first user's presence
received from the first apparatus and a second user's presence received
from the second apparatus, wherein the first user uses the first
apparatus and the second user uses the second apparatus; a unit for
registering a matching condition for another user's presence received
from the first apparatus and designated by the first user and a matching
condition for another user's presence received from the second apparatus
and designated by the second user; and a unit for deciding if the first
and second user's presences match the designated conditions when
registration processing and/or update processing is performed.