| 摘要 |
It is judged whether a fingerprint authentication process has successfully been performed, based on a result obtained by comparing input fingerprint information generated from a fingerprint image input through a fingerprint sensor with registered fingerprint information registered in advance. In the case where a result indicating that the authentication process has failed has been obtained, an overlapping area size corresponding to the time when the input fingerprint information and the registered fingerprint information overlap each other the most is obtained. By using the overlapping area size and a similarity level indicating a matching degree between the input fingerprint information and the registered fingerprint information corresponding to the time when these images overlap each other the most, it is judged whether a re-input of an input fingerprint image should be requested. In the case where the judgment result is in the affirmative, the re-input of an input fingerprint image will be requested.
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