| 摘要 |
To reduce the operations required by a user to perform user authentication using the user's communication apparatus, a call module (4d, 5d, 6d) acquires, upon receiving a user ID, a unique ID corresponding to the user ID and being of a user communication apparatus (11) by using a user ID matching list (4b, 5b, 6b), and also randomly selects one originating number with an originating number selector (4c, 5c, 6c). The call module (4d, 5d, 6d) makes a call with a predetermined number of rings to the user communication apparatus (11) having the unique ID corresponding to the user ID by using the selected originating number and via a system communication apparatus (13, 14, 15). After a predetermined number of rings, when a callback module (11b) of the user communication apparatus (11) makes a callback based on an instruction from a user (1), the call module (4d, 5d, 6d) performs user authentication based on a unique ID in the callback received via the system communication apparatus (13, 14, 15) and on the unique ID to which the call has been made.
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