1. A dictionary image renewing method in a fingerprint identification device which registers images into a dictionary memory as multiple dictionaries, the method comprising extracting images from a plurality of fingerprint images determined as being acceptable identification by mutual identification and using said multiple dictionaries to perform identification processing of entered fingerprint images, including successively identifying by comparing entered fingerprint images with the dictionary images registered in said multiple dictionaries, and when identification acceptance results with any one of the multiple dictionaries, the one dictionary determined as being identification accepted being renewed to the dictionary image registered in any one of the remaining dictionaries, and said remaining multiple dictionaries being renewed to the dictionary image extracted from said entered fingerprint images.