Apparatus for sharing code division multiple access and japan code division multiple access in communication system

An apparatus for sharing CDMA(Code Division Multiple Access) and JCDMA(Japan CDMA) systems is provided to share function blocks, thereby reducing complexity during overlapping realization of particular functions as well as design costs while decreasing mounting areas in case of substantial realization. The first switch unit(203) selectively separates one of a receiving signal used by a CDMA system and a receiving signal used by a JCDMA system from signals received through an antenna(200), and outputs the separated signal to an LNA(Low Noise Amplifier)(209). The second switch unit(207) outputs a particular band of signal, from which only a frequency band of a used communication system is separated from signals outputted from the LNA, to a mixer.