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As the ubiquitous society grows in maturity, RFID is expected to be widely used. However, they still cost more than bar codes. To make them cost-effective, it is necessary to develop applications that make secondary use of them. As such an application, we consider a wide-area advertising system, and propose an algorithm that selects advertisement to be displayed based on the people's interest information extracted from RFID tags they carry. We propose to use the "relevance rate" as a criterion for that selection, and show that the proposed algorithm selects an effective advertisement for display.