Slave device information transmitting unit of the present invention transmits slave device information to a mobile phone. Slave device transfer data receiving unit receives slave device transfer data from the mobile phone, and stores the slave device transfer data in storage unit. Destination slave device determining unit extracts destination slave device information from slave device transfer data stored in storage unit, and selects a cordless telephone slave device which is a destination of the slave device transfer data, based on destination slave device identification information which is set in the destination slave device information. Slave device transfer data transmitting unit transmits slave device transfer data to a cordless telephone slave device selected by destination slave device determining unit.