A power supply apparatus includes: a plurality of input ports configured to receive input of electric power from a plurality of power sources, respectively; a charge and discharge circuit configured to receive the input electric power to be charged and discharged so as to generate electric power to be supplied to a load circuit; a switching circuit configured to individually switch connections between the plurality of input ports and the charge and discharge circuit; and a control circuit configured to perform control so as to give different timing of the switch among the input ports.