| 摘要 |
<p>Identification information for identifying IC tags 1 is recorded in association with time information expressing the time (timing) at which access using a first antenna 3 is gained, for example, the time from when antennas are switched to when the access is gained, and position information representing the positions of the antenna with respect to the direction of movement of the IC tags. Identification information is selected on the basis of time for switching to a second antenna arranged downstream of the first antenna, the recorded time information, the position of the second antenna, and the recorded position information, and the IC tags are accessed using the second antenna, on the basis of the selected identification information. When the IC tags are accessed by the plurality of antennas arranged along the moving path of the IC tags, failure of access can be prevented, and overall efficiency can be improved.
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