PROBLEM TO BE SOLVED: To display an operation of an arbitrary cycle so as to be comparable to a reference moving image. A form improvement support system S includes a network camera 1 that captures the running motion of a target runner, a reference moving image storage unit 331 that stores a reference moving image that captures the running motion of a model runner, and a moving image that captures the running motion. The running motion extraction unit 313 that extracts the keyframes in the above, the display reference video generation unit 332 that matches the keyframes in the reference video to the target video captured by the network camera 1, and the display reference video and the target video are linked. It has an image display device 4 for displaying the image. [Selection diagram] Fig. 1
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