1. A face identification device comprising: detection means for detecting face images from human body images taken by a camera; storage means in which a face image of a specific person is previously stored; determination means for determining whether a face image detected by said detection means matches with the face image stored in said storage means by comparing both face images; and abstraction means for applying an abstraction process to a predetermined face image out of the face images detected by said detection means in order to make the predetermined face image unrecognizable, said abstraction means applying the abstraction process exclusively to a detected face image when said determination means determines that both face images do not match with each other, and not applying the abstraction process to a detected face image when said determination means determines that both face images match with each other.