Abstract: This invention relates to a motion diagnosis system which picks up motions of a subject and analyzes them, and is characterized by measuring address data at points of images thus picked up according to a trigger condition set in advance, displaying the result of the measurement in graphic images or stored images or in comparison with reference images, outputting the evaluation of such comparison to thereby enable measurement under flexible trigger conditions and analyzing the motions of the subject based on quantitative data in a manner easily understandable by the viewers and simple operation.