POWER SUPPLY DEVICE AND POWER SUPPLY METHOD

Provided are a power supply device and a power supply method which can carry out proper charging even when a plurality of electric automobiles are connected to a charging stand. A charging stand (1) is a power supply device which has a plurality of charging cables (4, 5) connected thereto and also supplies power to electric automobiles (2, 3) by way of the charging cables (4, 5). The charging stand (1) is provided with: a charging cable identification signal transmitter (9) for transmitting a charging cable identification signal to the electric automobiles by way of the charging cables (4, 5); an electric automobile identification signal receiver (10) for receiving an electric automobile identification signal and a charging cable identification signal from the electric automobiles (2, 3) by way of the charging cables (4, 5); and a controller (11) for charging the electric automobiles (2, 3) when the electric automobile identification signal receiver (10) receives the electric automobile identification signal and the charging cable identification signal.