When a user operates a processing apparatus through a touch panel, a fingerprint processing unit reads fingerprint information of the user's finger. Each time when the fingerprint processing unit reads fingerprint information, a CPU judges whether the read fingerprint information is identical to a fingerprint information of authenticated user. If being identical, the processing apparatus executes a process in accordance with an operation accepted through the touch panel. These two fingerprint information are identical each other if the operating user through the operation accepting panel is the authenticated user. It means that the processing apparatus judges whether the operating user is the authenticated user, each time when the user operates. If the user is the authenticated user, the process in accordance with the operation by this user is then executed.