Communication control apparatus, communication system, and communication control method

A communication system comprising:

• a plurality of relay management apparatuses configured to relay content data transmitted from communication terminals;
• and
• a communication control apparatus configured to control establishment of sessions for transmitting the content data between the communication terminals, wherein
• each of the relay management apparatuses includes
• a delay measurement unit configured to measure a delay time between one of the relay management apparatuses and the other one of the relay management apparatuses, and
• a transmitter configured to transmit the measured delay time to the communication control apparatus, and wherein
• the communication control apparatus includes
• a route setter configured to select one or more relay management apparatuses for relaying the content data from among the plurality of relay management apparatuses to set a route for transmitting the content data, based on delay information for each of the sessions;
• a selector configured to select, from among the relay management apparatuses selected by the route setter, a relay management apparatus to synthesize the content data transmitted from the communication terminals so as to transmit the synthesized content data to the communication terminals that join the session;
• and
• a transmitter configured to transmit selection information indicating the selected relay management apparatus to, among the communication terminals that join the established session, at least one communication terminal coupled to a relay management apparatus differing from the selected relay management apparatus.

A communication control method executed by a communication control apparatus configured to control establishment of a session for transmitting content data between the communication terminals, the communication control method comprising:

• selecting one or more relay management apparatuses for relaying the content data from among the plurality of relay management apparatuses to set a route for transmitting the content data, based on delay information for each of the sessions;
• selecting, from among the selected relay management apparatuses for setting the route, a relay management apparatus to synthesize the content data transmitted from the communication terminals so as to transmit the synthesized content data to the communication terminals that join the session;
• and
• transmitting selection information indicating the selected relay management apparatus to, among the communication terminals that join the established session, at least one communication terminal coupled to a relay management apparatus differing from the selected relay management apparatus.