To provide a mobile telephone set in which functions useful for a user are provided even while carried by the user by expanding functions of the mobile telephone set.

An acceleration sensor 23 is packaged in a mobile telephone set 10 and based upon a change in the acceleration detected by the acceleration sensor 23, the number of steps taken by the user is measured. Based upon the measured number of steps taken, a walking distance of the user of calorie consumption is calculated and such information is displayed on a display part 12 as a change in a character, numeral or character display state.