Patent ID: 7956745

Claim:
A wireless tag detection apparatus comprising: transmission means for transmitting query signals to one or more wireless tags via radio communication; reception means for receiving one or more response signals transmitted via radio communication from the one or more wireless tags based on query signals transmitted via radio communication from the transmission means; specification means for specifying a wireless tag to be retrieved; extraction means for extracting tag identification information corresponding to the wireless tag specified by the specification means; selection means for selecting a response signal containing tag identification information if the tag identification information is the same as the tag identification information extracted by the extraction means, from the one or more response signals received by the reception means; detection means for detecting strength of the response signal selected by the selection means each time the response signal is selected; and informing means for informing whether a distance to the wireless tag specified by the specification means has shortened or increased according to comparison of strengths between each detection performed by the detection means.