Patent ID: 7236614

Claim:
A living body identifying device comprising: a living body information imaging means for imaging living body information; a registration data storage means for storing a registration data; an identifying means for identifying the living body information thus imaged with the registration data, comprising: an optimization candidate data extracting means for extracting an optimization candidate data for data renewal from the imaged living body information when the living body information is identified; an optimization candidate data storage means for accumulating a plural of said optimization candidate data extracted by said optimization candidate data extracting means when a renewal time comes or a renewal request is made; a renewal storage means for newly storing data having high priority as new registration data from the plural of optimization candidate data accumulated in said optimization candidate data storage means and the registration data stored in said registration data storage means, thereby renewing the registration data when after renewing request has been made; an error rate calculating means for calculating an error rate of said imaging living body information, a registration data renewal target person extracting means for extracting registration data necessary to be renewed on the basis of the error rate calculated by said error rate calculating means; said error rate calculating means comprising: a circuit for maintaining: a first threshold value used for identification, a second threshold value set to be lower than the first threshold value, and an error value, wherein said error value is not more than the second threshold value.