Abstract: A service identification adding portion adds service identification information to a cell corresponding to each connection that uses a predetermined communication service (ABR service) and that is input to a switch system. A connection number counting portion counts the number of connections that use the communication service on each output line at predetermined intervals. A band control information generating portion generates band control information corresponding to each output line at predetermined intervals based on the number of connections counted at predetermined intervals. A band control information indicating portion sends band control information at predetermined intervals corresponding to each output line to a transmission side terminal corresponding to a connection that uses the communication service on each output line.