The present invention relates to a V2G system using an electric vehicle. The present invention is an electric vehicle for charging or discharging electric power; A charging and discharging device that performs charging and discharging of an electric vehicle; A charge/discharge management unit managing charge and discharge performed by the charge/discharge device; An energy storage system that stores discharge power managed by the charge/discharge management unit; A charging/discharging operation server that controls charging or discharging to be performed under the condition of the greatest benefit to the customer who has entrusted the discharge power stored in the energy storage system; It consists of an external power grid that purchases discharge power from the energy storage system that is discharged and stored and managed by the electric vehicle to supply it to the electric vehicle at the time when the customer's profit is maximized.
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