A wireless LAN board includes a wired LAN connector connected to a wired LAN board, an antenna connecting terminal connected with an antenna for performing radio signal transmission/reception, a wired LAN section connected to the wired LAN connector to transmit/receive a data signal to/from the wired LAN board, a wireless LAN section connected to the antenna connecting terminal to transmit/receive a data signal to/from an external device with the use of a radio signal through the antenna, and a controller section connected to the wired LAN section and the wireless LAN section to control the wired LAN section and the wireless LAN section.