Method and apparatus for communicating between terminals in a cognitive radio technique

A communication method in a CR(Cognitive Radio) environment and an apparatus for the same are provided to confirm the appearance of an incumbent user in a CR environment exactly and to minimize an interference phenomenon for the incumbent user. A terminal in a target cell judges whether a signal supplied through a candidate channel is detected(S400). If an arbitrary signal is detected, the terminal judges whether an existing channel which has been used in a neighbor cell is empty(S401). If not, the terminal executes a spectrum sensing process for the existing channel(S402). Then the terminal judges whether an incumbent signal is detected on the existing channel(S403). If not, the terminal informs the base station of the target cell that an incumbent user who uses the CR channel of the target cell has appeared(S404). The base station changes the CR channel(S405).