A femoral region supporter (2) supports a femoral region of a user (1) in a travel direction. A force detector (3) detects force received by the femoral region supporter (2) from the femoral region of the user (1). A walking motion estimator (4) estimates walking motion of the user (1) based on the force detected by the force detector (3). The video generator (5) generates a video to be presented to the user (1) based on the walking motion estimated by the walking motion estimator (4). The video presenter (6) presents the video generated by the video generator (5) to the user (1).
