CHARGING CONTROL SYSTEM, CHARGING CONTROL METHOD AND RECORDING MEDIUM

A charging control system that controls charging of an automobile that uses electric power as motive power include receiving means that receives electric power demands from an electric power supplier side; and control means that controls charging on and off of the automobile. The control means changes a ratio of a charging-on duration and a charging-off duration in each duration in allowable charging durations for the automobile according to changes of the electric power demands over time.