The invention provides an identification system and an identification method allowing a plurality of adjacent interrogators to efficiently perform radiocommunication with wireless tags while avoiding interference of radio signals. The method in which an interrogator identifies a wireless tag under a management of a management server provided with steps; the interrogator performs registration application to the management server, the management server performs registration of the interrogator, the management server makes interrogator information, the management server controls start and end ofcarrier sense performed by the interrogator, the management server controls transmission and stop of a wireless signal performed by the interrogator, the management server makes the interrogator transmit the result of carrier sense, the interrogator transmits the result of carrier sense, and the management server makes interrogator interference information.