A remote controller terminal uses a function item information receiving unit to receive function item information representing functions of an information terminal device to be operated, which is directly transmitted from the information terminal device, and uses a processing command transmitting unit to directly transmit a processing command corresponding to the received function item information to the information terminal device in accordance with user's input operation, and the device uses a processing command receiving unit to receive the processing command directly transmitted from the remote controller terminal, and uses a control unit to control the function corresponding to the processing command in order to execute predetermined processing in accordance with the instructions from the remote controller terminal without having a wired connection.