1. A biometrics authentication system for performing individual authentication comprising: an image capture unit which captures images of a hand; a storage unit which stores plural registered characteristic data of a palm of the hand; and a processing unit which extracts outlines of borders of the palm and a portion of fingers of said hand from captured said image of said hand, judges from detected position of said extracted outlines in a capture range of the image capture unit and a number of said extracted outlines whether a capture of said image has been successful, wherein a successful capture is obtained by correctly holding the hand over the capture range, extracts a blood image characteristic data as said characteristic data from an image of the palm of said hand which is judged to have been captured successfully, and registers said blood image characteristic data in said storage unit, wherein said processing unit obtains said image of the hand a plurality of times from said image capture unit, judges degrees of similarity among said blood image characteristic data for each of said plurality of images of the hand, and registers in said storage unit a plurality of said blood image characteristic data with a high degree of similarity.