Abstract: An authentication apparatus updates a first execution information entry corresponding to a first identification information entry of an authentication target having undergone authentication processing, and transmits the first identification and execution information entries to a management apparatus. The management apparatus updates an execution information entry corresponding to the first identification information entry, and stores a first sequence information entry indicating a sequence number. The management apparatus transmits the first sequence and identification information entries to the authentication apparatus.

Abstract: An authentication apparatus updates a first execution information entry corresponding to a first identification information entry of an authentication target having undergone authentication processing, and transmits the first identification and execution information entries to a management apparatus. The management apparatus updates an execution information entry corresponding to the first identification information entry, and stores a first sequence information entry indicating a sequence number. The management apparatus transmits the first sequence and identification information entries to the authentication apparatus.

Abstract: A center server includes an application identification information creating unit that allocates, on the basis of communication with a mobile terminal, identification information to an application that is set in the mobile terminal 1; a QR displaying unit that receives an acquisition request for electronic information via the application 10; a ticket displaying unit that creates associated information in which identification information on electronic information is associated with the identification information on the application; and a QR displaying unit that sends, on the basis of the identification information on the application acquired by the acquisition request and the associated information, the electronic information that is associated with the identification information on the application.

Abstract: In a server; a ticket allotting unit generates, in response to a first request from a first user, first-type image code and stores the first-type information in a management database (DB) in a manner corresponding to a second user. Moreover, in response to a second request from the first user, generates second-type image code which is different from the first-type image code and stores the second-type image code in the management DB in a manner corresponding to a third user. Then, for example, a QR returning unit invalidates the first-type information stored in the management DB and validates the second-type information stored in the management DB. Then, a QR displaying unit sends the second-type image code to the third user.