A wearable terminal (10) calculates an acceleration amount in the vertical direction by using an acceleration value. The wearable terminal (10) calculates a change amount in an atmospheric pressure value by using atmospheric pressure values. Further, the wearable terminal (10) multiplies the acceleration amount in the vertical direction by the change amount in the atmospheric pressure value. After that, the wearable terminal (10) detects a change amount in the vertical direction on the basis of the calculated multiplication result. For example, when the multiplication result is a positive value, the wearable terminal (10) sets the change amount in the vertical direction as "0". When the multiplication result is a negative value, the wearable terminal (10) sets the multiplication result as the change amount in the vertical direction.
