To improve the efficiency of consuming electric power and also providing correct motion data by surely discriminating whether the user is stopping or not.

The motion data controller controls such that it acquires data of present position with a predetermined interval while the user is moving, calculates the present motion data and displays them from the acquired positional data (A5 to A13), but extends the time interval in the case the motion is stopped to no longer the vibration detect, and returns the extended time interval as it is in the case the vibration is detected again (A15 to A16, A17 to A27).