To prevent shoplifting more effectively without exerting any bad influence on a commodity and a human.

For example, if a criminal tries to peel off an IC tag 22 with a built-in scented sheet 36, which is stuck to a commodity 21, from the commodity 21, the scented sheet 36 is exposed to the outside, and aroma molecules 51 are diffused around from the scented sheet 36. In this way, a person near to the criminal recognizes that the criminal tries to break the IC tag 22 with the built-in scented sheet. Consequently, the criminal cannot shoplift the commodity 21 by peeling off the IC tag, and shoplifting of the commodity 21 can be surely prevented. This invention is applicable to a shoplifting preventing RFID system.