A Mobile Station (MS) operation method for cell selection at initial access in a wireless communication system in which one or more small Base Stations (BSs) are included within a macro BS service coverage area is provided. The method includes performing synchronization based on a preamble signal, after performing the synchronization, transmitting a ranging code to a first BS, after transmitting the ranging code, transmitting a ranging request message including position information of the MS, to the first BS, and receiving a ranging response message including information on at least one candidate BS from the first BS. Thus, the MS can select a BS using position information of the MS in a wireless communication system in which various types of BSs coexist.