An electric automobile has a battery and also has a travel motor and a vehicle interior load device which operate using electric power from the battery. In response to a request for a start of electric power supply to the vehicle interior load device with the automobile being at a standstill, the electric automobile determines, based on the charged state of the battery, whether electric power from the battery can be supplied to the vehicle interior load device. When determining that the electric power from the battery cannot be supplied to the vehicle interior load device, the electric automobile makes a request to an electric power supply device to supply electric power to the vehicle interior load device. In response to the request, the electric power supply device electrically connects to the vehicle interior load device and starts supply of electric power to the vehicle interior load device.