In a replay mode control device, the replay mode in reproducing music or video contents is controlled so as to be suitable for a user. A headphone 15 of a mobile music reproducing device 10 is provided with a vibration sensor 12 for detecting movements of the user in the up-and-down direction. A walking movement detection unit 13 detects the walking interval of the user based on an output of the vibration sensor 12. A replay mode controller 14 manages control to adjust the replay rate of music contents to the walking interval of the user. <IMAGE>
