A radio communication apparatus and a frequency generating method thereof the communication apparatus including a frequency generator to generate a plurality of local oscillator (LO) frequencies; and a mixer to convert a frequency of an input signal by mixing the input signal with at least two of the LO frequencies generated by the frequency generator. As the LO frequencies are generated using the single VCO to support the radio communication standard of the multiple bands, the circuit area can be reduced and the multimode and multiband can be supported with one chip.