Patent ID: 8228174

Claim:
A radio integrated circuit (IC) tag reading device that can use a plurality of unit radio channels and reads a radio IC tag, comprising: a first oscillation means for generating a signal having a frequency meeting a unit radio channel to be used for transmission/reception to/from the radio IC tag; a transmission/reception means for executing transmission/reception to/from the radio IC tag, using a signal generated by the first oscillation means; a second oscillation means for generating a signal having a variable frequency meeting a unit radio channel that measures strength of a received electric wave; a carrier sense means for measuring strength of a received electric wave regarding each unit radio channel using the signal generated by the second oscillation means; and a control means for controlling the first oscillation means so as to generate a carrier wave signal having a frequency meeting a unit radio channel to be used by the transmission/reception means, the unit radio channel being selected based on a measured result by the carrier sense means, upon passage of a continuous transmittable time that is a time during which the unit radio channel to be used for transmission/reception to/from the radio IC tag can be used continuously, after start of the transmission/reception by the transmission/reception means.