| 摘要 |
PROBLEM TO BE SOLVED: To make obtainable communications with high reliability in spite of utilizing plural sheets of media by providing a reading means which reads the information on the communication media when a polling connection is secured between both communication media for the mutual authentication and a communication means which tries the polling connection again after the mutual authentication. SOLUTION: A CUP gives a re-polling function to communication equipment 26 to permit the simultaneous use of plural tickets so as to enable a single person to combine plural communication cards 19 when these cards are used. Owing to the re-polling function, the information on the cards 19 are read for the mutual authentication when the polling connection is secured between both cards 19 for the mutual authentication in a non-contact ticket examination application mode, and the polling connection is tried again. Thereby, the connection of communication can be established with the card 19 that was not accepted at first by trying again the polling connection even when the number of accepted authenticated cards 19 is smaller than the number of cards 19 which were used at an initial polling stage. |
