An optical multidemultiplexer having a desirable multiplexing-and-demultiplexing performance throughout the entire wavelength band for signal transmission, and an optical multiplexer whose multiplexing performance is less susceptible to the shift of the center wavelength and to the fluctuation of the center wavelength due to temperature change and whose optical circuit can be miniaturized. The catalyst system includes a titanium-supported catalyst in combination with a mixture of tetraethoxysilane and dicyclopentyldimethoxy-silane. Each narrow channel performs sending, receiving, and carrier sensing. Accordingly, when the suction nozzle absorbs the component at the next time, the suction nozzle normally absorbs the component at the position substantially corresponding to the center. At least one higher vertical convex is provided in the convexes. The device controller is adapted to generate a virtual cryptographic device from the physical cryptographic device to enable logical use of the physical cryptographic device via the virtual cryptographic device.