The entertainingness and the feeling of exaltation of content reproduction itself can be promoted by reflecting the movement of the user on the content reproduction. The timing of step of the walking user and the timing of the swing or sway return of the user's body are detected. The content of a musical composition, a moving image, or the like is so reproduced that the detected timing is synchronized with the timing of the beat or bar of the musical composition or the timing of a scene change or a cut change of the moving image.