In this paper, it has proposed about the charge-and-discharge control system which raises the efficiency of the electric power storage equipment using a capacitor by decreasing the variation in inter-terminal voltage of the capacitors resulting from the variation in capacitance. That is, by a pair of capacitors, and some switches which switch them in series or in parallel, circuit brock is constituted, further, the circuit brock is connected to n stage series, and an electric power storage part is constituted. And in order to always maintain the output voltage of an electric power storage part to allowable-input-voltage within the limits of an electric power converter, connection of the capacitors in each circuit block is switched in series or in parallel. In that case, when a multiple connection part is required, by constituting multiple connection parts not only including a pair of capacitors which constitute each block but two capacitors which adjoin mutually, inter-terminal voltage of all the capacitors is equalized, and the charge-and-discharge efficiency of electric power storage equipment is raised.