Patent ID: 8072550

Claim:
A remote control unit capable of bidirectionally communicating with a controlled apparatus, the remote control unit comprising: a display unit; a detector unit that detects a voltage of a battery; and a control unit that (a) determines whether or not a state of transmission between the controlled apparatus and the remote control unit is degraded or recovered, (b) controls the remote control unit to transmit a first command for requesting the controlled apparatus to reduce a data size of a moving image or still image, when the state of transmission between the controlled apparatus and the remote control unit is degraded, (c) controls the remote control unit to transmit a second command for requesting the controlled apparatus to increase the data size of the moving image or still image, when the state of transmission between the controlled apparatus and the remote control unit is recovered, (d) determines whether or not the remote control unit receives external power from an AC adapter or the battery after the first command or the second command is transmitted to the controlled apparatus, (e) controls the remote control unit to transmit a third command for requesting the controlled apparatus to transmit the moving image from the controlled apparatus to the remote control unit so that the remote control unit receives the moving image from the controlled apparatus and displays the moving image received from the controlled apparatus on the display unit, when the remote control unit receives the external power from the AC adapter, (f) controls the remote control unit to transmit the first third command so that the remote control unit receives the moving image from the controlled apparatus and displays the moving image received from the controlled apparatus on the display unit, when the remote control unit receives the external power from the battery and the voltage of the battery detected by the detector unit is not lower than a predetermined level, and (g) controls the remote control unit to transmit a fourth command for requesting the controlled apparatus to transmit the still image from the controlled apparatus to the remote control unit so that the remote control unit receives the still image from the controlled apparatus and displays the still image received from the controlled apparatus on the display unit, when the remote control unit receives the external power from the battery and the voltage of the battery detected by the detector unit is lower than the predetermined level.