| 摘要 |
PROBLEM TO BE SOLVED: To make a user and a card correspond to each other to detect the position of the user by providing a position detection means which detects the position of the owner of the card in accordance with a communication area which the card communicates with. SOLUTION: When a card C communicates through an antenna a1, the ID card is stored in a memory of a controller 4 correspondingly to the antenna a1, and it is judged that a user (a) exists near the antenna a1. When the card C next communicates through an antenna a2, the card ID related to the antenna a1 is cleared, and the card ID is stored in the memory correspondingly to the antenna a2, and it is judged that the user (a) exists near the antenna a2. When the card communicates through an antenna a3, it is judged in the same manner that the user (a) exists near the antenna a3. When communication between the card C and the antenna a3 is broken, the card ID related to the antenna a3 is cleared, and it is judged that the user (a) has gone out of a ticket examination passage P. |
