Device, system, and method for identifying living bodies and renewing registration data

There are provided a living body collating device, a living body collating system and a living body collating method, which is equipped with optimization candidate data extracting means for extracting optimization candidate data for data renewal from past record data of living body information achieved, optimization candidate data storage means for storing the optimization candidate data extracted by the optimization candidate data extracting means , and renewal storage means for storing, as new registration data, the data having higher priorities of the optimization candidate data stored in the optimization candidate data storage means and registration data stored in registration data storage means.