Motion display system and recording medium

A motion display system, comprising:

• an acceleration sensor that detects an acceleration of a body part of a test subject;
• an imager that generates a moving image by imaging a motion of the test subject;
• an identifier that is attached to the test subject to determine a position of the body part within the moving image;
• and
• a superimposer that superimposes a motion trajectory of the body part generated based on the acceleration detected by the acceleration sensor on a position of the body part determined based on the identifier within the moving image generated by the imager in synchronization with the moving image;
• a display that displays the moving image on which the motion trajectory is superimposed by the superimposer, wherein:
• the superimposer superimposes the coordinate-transformed motion trajectory on the moving image,
• the specific point is an origin point of the coordinate system of the motion trajectory,
• the origin point matches with the fixed point of the test subject within the moving image, and moves along the movement of the fixed point within the moving image,
• the acceleration sensor is a three-axis acceleration sensor,
• the superimpose superimposes the motion trajectory of the body part expressed in a three-dimensional coordinate system, and
• the motion display system further comprises an estimator that estimates right and left motions of walking of the test subject by integrating areas of a plurality of micro-triangles that constitute the motion trajectory.