To provide a radio station system which can realize radio communication service of a plurality of frequency bands with flexible configuration of high-definition, in the case that the service is realized.

A slave station instrument 4 is connected to a key station instrument 2 by using an optical fiber cable 5, the required number of transceiver amplifiers 6 are connected to the slave station instrument 4, respectively by using metal cables 7, antennas 8 are connected to the transceiver amplifiers 6, respectively, and communication area of a mobile communication apparatus 9 is formed. Units U1-U3 which are arranged in the slave station instrument 4 and perform photoelectric conversion and modulation/demodulation and the transceiver amplifiers 6 are instruments corresponding to frequency bands of communication service, so that amplification wherein distortion is restrained is performed. Further, expansion of service is easily enabled by extension of the instruments.