The infrared communication unit of the mobile phone receives a first data series transmitted from the other-party mobile phone by infrared communication, and, when transmitting a second data series by infrared communication, the controller of the mobile phone controls the infrared communication unit so as to transmit the second data series in response to completion of reception of the first data series. Alternatively, the controller controls the infrared communication unit so as to receive the first data series in response to completion of transmission of the second data series.