Two antennas (11A, 11B) and an IC chip (12) that operates independently from the antennas (11A, 11B) are provided within the package (10) of an RFID tag (1). Interrogation zones (A, B), which extend in different directions from one another when viewed from a front surface (10a) of the package (10), are set by adjusting the direction of radio waves from the antennas (11A, 11B). A reader/writer that communicates with the tag (1) selects one of the interrogation regions (A, B), and transmits a command including identification information for the selected interrogation region. A control circuit within the IC chip (12): executes a command with consistency between the identification information included in the received command and the antenna that received the command as a prerequisite; and returns reply information by means of the antenna that received the command.