An image processing apparatus includes display panels included in each of an operation unit 130 and a display unit 136, and a control unit causing the two display panels to successively make transitions to a power save mode if a prescribed time period has passed without any operation to the operation unit 130. The layer of dielectric material may be patterned using established thick film techniques, and good dimensional control can be achieved. In this way, the present invention can provide an RF return path for legacy terminals that shares a return path for regular data packets in an optical network architecture. Additionally, three-dimensional photonic crystal waveguides of an inverted-opal structure having a photonic band gap in all light-traveling directions can be fabricated. The instructions defined in the another computer system architecture emulate the instructions defined for the one computer system architecture.