A call control system performs call control for a terminal which accesses different radio access network systems. A communication exchange processing apparatus includes: a device storing maximum bandwidth for specified calls processed in the radio access network system; a device measuring present bandwidth for specified calls presently processed in the radio access network system; a device computing a ratio of the present bandwidth to the maximum bandwidth for specified calls; and a device sending specified call band ratio information indicating the ratio of present bandwidth to maximum bandwidth for specified calls to a radio network control apparatus in the radio access network system and connected to the present communication exchange processing apparatus. The radio network control apparatus provided in the radio access network system includes a device sending the specified call band ratio information to a terminal which is connected to the present radio network control apparatus by radio communication.