The present invention is designed to provide highly efficient local area radio access. In a communication system in which a mobile terminal apparatus (10) detects a local area base station apparatus (30) which the mobile terminal apparatus (10) will connect to, among local area base station apparatuses (30), the local area base station apparatuses (30) transmit detection signals to be used to detect the local area base station apparatus (30), to the mobile terminal apparatus (10), in the radio communication scheme for the local areas which is different from the radio communication scheme for the wide area, and also transmit associated control signals that are attached to the detection signals and that allow a local area to execute connection control by itself, to the mobile terminal apparatus (10), andthe mobile terminal apparatus (10) receives the associated control signals only when detection signals that are secured for the connection control by the local area alone, among the detection signals, are received.