A smart phone includes photoelectric pulse wave sensing units that obtain photoelectric pulse wave signals from hands holding the smart phone, a touch screen on which a plurality of operation switches that accept operations performed by thumbs are displayed, and a switch arrangement changing unit that changes the arrangement of the displayed plurality of operation switches. The switch arrangement changing unit, when photoelectric pulse wave signals are obtained by the photoelectric pulse wave sensing units, changes the arrangement of the operation switches displayed on the touch screen in such a manner that the operation switches are arranged along a circular arc of a virtual circle whose center is located at a carpometacarpal joint of the thumb of a right hand performing operations and whose radius is the distance from the carpometacarpal joint to the tip of the thumb.
