Patent ID: 7130914

Claim:
A database synchronization system for synchronizing data of databases of a first apparatus and a second apparatus connected to each other through a network, comprising: first differential information update notification means provided in said first apparatus for extracting only differential information of said database of said first apparatus and issuing a notification of the differential information to said second apparatus; second differential information update notification means provided in said second apparatus for extracting only differential information of said database of said second apparatus, issuing a notification of the differential information to said first apparatus and updating said database of said second apparatus with the differential information of said database of said first apparatus, a power supply for said second apparatus; a data buffer for receiving the differential information transmitted from said first differential information update notification means, temporarily storing the received differential information and transferring the stored differential information to said second apparatus; and power supply control means for controlling said power supply for said second apparatus when the differential information from said first differential information update notification means is stored into said data buffer.