Provided are an apparatus and method for providing a multi-antenna scheme in a wireless communication system by using a plurality of terminals. In a downlink receiving scheme at a mobile terminal, a terminal group is established comprising the mobile terminal and at least one adjacent terminal The mobile terminal receives a first signal from a base station, and at least one second signal through a short-range communication network from the at least one adjacent terminal The at least one second signal is representative of the first signal transmitted from the base station as received at the at least one adjacent terminal A received signal is detected as an antenna array signal on the basis of the first and at least one second signals. A similar scheme may be used for uplink transmissions, in which a virtual antenna array is established with a terminal group for transmitting uplink.