ENERGY DISPLAY SYSTEM, DISPLAY DEVICE, AND ENERGY DISPLAY METHOD

An electric vehicle charging and discharging system according to the present invention includes: a charge and discharge unit capable of charging a battery mounted on an electric vehicle and discharging the battery; a first communication unit that acquires a vehicle identification number of the electric vehicle and a dischargeable capacity value indicating a dischargeable amount of power of the battery from the electric vehicle when the electric vehicle is connected with the charge and discharge unit; and a display unit that displays the vehicle identification number and the dischargeable capacity value acquired by the first communication unit.