2. The face annotation method as recited in claim 1 , wherein the social relationship information includes a plurality types of social network context information including a recurrence context, a temporal context, a group context, and a temporal-group context.
3. The face annotation method as recited in claim 2 , wherein the pyramid database unit includes four layers of database, wherein a first layer is based on the recurrence context, a second layer is based on the temporal context or the temporal-group context, a third layer is based on the group context, and a fourth layer contains all face images of contacts and the current owner.