| 摘要 |
A device comprises an authentication section that compares a characteristic included in a user's input into an input section with a characteristic of a person registered in a comparison data memory so as to determine an authentication result. An authentication control section comprises a function to store a value indicating a likelihood of being the person, which is determined based on the above authentication result, and to control the value indicating a likelihood of being the person which is to be stored, based on the authentication result determined as above from a user's input including input other than input done in response to an input request for authentication, and based on a passage of time; and a function to, in response to an instruction to begin a process which requires authentication, control whether or not to permit execution of the process depending on whether or not a stored value indicating a likelihood of being the person is a certain threshold or more. Unauthorized use of a device is prevented, while a trouble of being asked to make a special input for authentication is resolved when a process requiring authentication is executed.
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