| 摘要 |
PROBLEM TO BE SOLVED: To provide a personal digital assistant capable of storing only useful information for identifying an illegal user. SOLUTION: When a coincidence determination section 402C determines that the degree of coincidence between feature information and registration feature information is smaller than an authentication threshold, although the feature information has been extracted from a photography image at a feature extractor 402A; an error history information management section 404 stores error history information at that time in an error history information storage 414. As a result, only when a person who differs from a true user, for example a person who has stolen a portable telephone, or the like, tries to use the portable telephone illegally, and the feature information is extracted from the face image of the person, history information, where authentication has failed in authentication processing, is stored as the error history information, and the person can be identified from the error history information after the portable telephone is retrieved. COPYRIGHT: (C)2007,JPO&INPIT |
