Electronic device and method controlling electronic power supply

An electronic device (100) including; a connecting unit connected to a connection line supplying an electric power of a predetermined rating and transmitting and receiving an information; a charging unit (111) conducting a charging of a charging battery connected to an own device, by the electric power supplied by the connection line; an electric supplying unit (109) supplying an electric power to a recording medium storing an information; a reading-and-writing unit (108) performing a reading-and-writing operation of the recording medium; and an electronic source controlling unit (104) performing a control of the electric power supplied to the charging unit (111), when the reading-and-writing unit (108) performs the te&ding-and-wi6ng operation of the recording medium, according to an access request to the recording medium via the connection line,