An apparatus is provided with first information on software and character strings for determining a keyword related to second information on software that a user wants to use. According to a wireless LAN transceiver in which the present invention is implemented, when a data throughput attained by an application layer poses no problem, switching antennas is disabled. The output ends of the light pipes are distributed evenly along each side face of the light guiding layer so as to provide homogeneous illumination to the display area. The improved transresistance amplifier is particularly useful as part of a pick-up circuit in CD and DVD-ROM applications.