| 摘要 |
This invention prevents delays that occur when a reader/writer identifies contactless IC cards when there is a plurality of contactless IC cards in the communication area of the reader/writer, or in other words, prevents collisions between initial responses when the contactless IC cards perform initial responses. The contactless IC card comprises a plurality of random-number-generation units that generate a random number for setting a slot; and a random- number-generation-instruction unit designates the random-number- generation unit from among the plurality of random-number-generation units to be used for performing a response. A slot-setting unit uses the random number generated by the random-number-generation unit that was specified by the random-number-generation-instruction unit and performs a response to the reader/writer.
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