Patent ID: 7664835

Claim:
A communication control unit, comprising: a receiving unit configured to receive destination terminal identification information uniquely identifying a destination communication terminal to which a message is destined, and software for communication control from a source communication terminal from which the message is sent; an installation execution unit configured to install the software received by the receiving unit; an address information acquisition unit configured to transmit the destination terminal identification information received by the receiving unit to an externally located address information management apparatus, and to acquire, from the externally located address information management apparatus, address information of another communication control unit to which the destination communication terminal corresponding to the destination terminal identification information can be connected; and a transmitting unit configured to transmit the destination terminal identification information received by the receiving unit and software identification information uniquely identifying the software installed by the installation execution unit, to an address of the another communication control unit included in the address information acquired by the address information acquisition unit, and to transmit software identification data to the source communication terminal when the receiving unit receives, over a network, the software identification data and information identifying the source communication terminal, wherein the receiving unit is further configured to receive software corresponding to the software identification data, after the transmitting unit transmits the software identification data, and the installation execution unit is further configured to install the software corresponding to the software identification data to control a network connection of the source communication terminal to the network via the communication control unit.