A radio transmitting/receiving device having at least three modules. The first module includes a first function for amplifying a radio frequency signal, demodulating the amplified radio frequency signal to a baseband signal and outputting the same, and a second function for modulating the input baseband signal, converting the modulated baseband signal to a radio frequency and outputting the same. The second module includes a function for amplifying the input radio frequency. The third module includes a function for executing a baseband signal process and controlling respective units according to a transmission/reception sequence based on a communication protocol.