Biogenic information of the user is obtained through a camera unit and an authentication sensor and compared with biogenic information of a person with use authority has previously been stored, thereby discriminating whether or not the user has the use authority. When the user is authenticated, that is, if it is determined that the user is the person with the use authority, an electronic apparatus permits the user to use each function and operate. The authentication of the user is executed when the user wears the electronic apparatus. After he removes it, the authentication result is not held, thereby disabling a person without the use authority to use the electronic apparatus. The biogenic information (physical feature) of the user is detected and the personal authentication can be executed without requiring the user to execute the annoying inputting operation for the personal authentication.