A communication management system stores session identification information for identifying one or more communication sessions for providing the service, and use state information indicating whether each one of the communication sessions is being used. In response to receiving from a first communication terminal a request for starting communication including first service identification information for identifying a first service, the management system transmits to the first communication terminal a session identification information of one of the communication sessions having the use state information indicating that the communication session is not being used based on determination.