COMMUNICATION MANAGEMENT SYSTEM, COMMUNICATION TERMINAL, COMMUNICATION SYSTEM, COMMUNICATION CONTROL METHOD, AND CARRIER MEANS

A communication management system (50) transmits a request for obtaining capability information indicating capability of a first communication terminal (10) of a plurality of communication terminals (10), to the first communication terminal (10) through a network, receives capability information of the first communication terminal (10) from the first communication terminal (10), determines a set value for each one of a plurality of set items to be configured in providing a service plan corresponding to the capability of the first communication terminal (10), based on the capability information of the first communication terminal (10), and transmits the determined set value of each one of the plurality of set items to a relay device (30), as an operating parameter for controlling the relay device (30) in transmitting or receiving content data to or from the first communication terminal (10) according the service plan corresponding to the capability of the first communication terminal (10).