To easily find that a ticket is not rightfully issued while improving usability by generating cipher ticket information from ticket information to be issued and discrimination information registered on a medium and entering it into the medium.

A ticket reservation sales management file 2 in a ticket center 1 contains data showing the reservation sales state of tickets. A user management file 3 contains data showing individual identification information, account settlement information, a use history, etc., entered into a member master. Then a processor 4 processes requests for vacant seat information inquiry, reservation sales, etc., refers to and updates the files 2 and 3, and confirms the payment capability of a user when the settlement of a ticket charge is needed and performs the settlement. Further, a system constituted by mounting a ticket purchase processing means 7 on a personal computer, etc., and connecting an IC card writer 8 is used as a ticket purchase terminal 6.