A smart phone (1) includes photoelectric pulse wave sensing units (41 and 42) that obtain photoelectric pulse wave signals from hands holding the smart phone, a touch screen (21) on which a plurality of operation switches (31) that accept operations performed by thumbs are displayed, and a switch arrangement changing unit (111) that changes the arrangement of the displayed plurality of operation switches (31). The switch arrangement changing unit (111), when photoelectric pulse wave signals are obtained by the photoelectric pulse wave sensing units (41 and 42), changes the arrangement of the operation switches (31) displayed on the touch screen (21) in such a manner that the operation switches (31) are arranged along a circular arc (510) of a virtual circle whose center is located at a carpometacarpal joint (500) of the thumb of a right hand (501) performing operations and whose radius is the distance from the carpometacarpal joint (500) to the tip of the thumb.
