Identity of the individual being the device which biometrics is collated with fingerprint information, you grasped fingerprint information continually from control means, and memory expedient and the part territory of the finger you extracted the collation data from the fingerprint information which is grasped from expedient and a certain part territory which are housed in the aforementioned memory expedient, the decision making expedient which is decided whether the expedient which is housed in the aforementioned memory expedient and, the expedient which it collates processes the collation data which is extracted and, fingerprint information was grasped from the new part territory, and, it has. At least, when fingerprint information is grasped from the new part territory, it is used in order to renew the content of the aforementioned memory expedient by the aforementioned control means, the aforementioned renewal is to delete fingerprint information from the part territory which is grasped in the past, in addition as for the aforementioned control means, or is something which renews the collation data which is housed before the time at the time the description above.
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