An information terminal device includes an imaging unit which captures a face image of a user, a main memory which extracts and stores an eyeball area and an under eye region from the face image, and a control unit which detects an amount of color change in a pupil and iris color at a current point in time relative to the pupil and iris color in the eyeball area at a past point in time after factoring in an amount of color change from face skin color in the entire face image that includes the eyeball area and the undereye region captured by the imaging unit at the current point in time compared to the entire face image that includes the eyeball area and the under eye region captured at a past point in time.
