Patent ID: 8296391

Claim:
A communication apparatus configured to communicate through a first relay server connected to a first network with a second relay server connected to a second network, and to function as a first client terminal connected to the first network, the communication apparatus comprising: a relay group information storage unit configured to store relay group information indicating that the first relay server and the second relay server constitute a relay group; a relay server information storage unit configured to store relay server information; the relay server information including: first relay server information created by the first relay server, the first relay server information including first relay server activation information indicating an activation state of the first relay server, and first client terminal registration information regarding the first client terminal which is registered in the first relay server, the first client terminal registration information includes a connection state between the first relay server and the first client terminal; and second relay server information created by the second relay server, the second relay server information including second relay server activation information indicating an activation state of the second relay server, and second client terminal registration information regarding a second client terminal connected to the second network and registered in the second relay server, the second client terminal registration information includes a connection state between the second relay server and the second client terminal; a shared resource information management unit configured to manage shared resource information regarding a shared resource shared with the second client terminal; and a copy resource information management unit configured to acquire a copy of a first shared resource based on the relay group information, the relay server information and the shared resource information, and manage a copy resource individual information that allow the first shared resource and the copy of the first shared resource to correspond to each other.