The present invention enables the quantitative evaluation, in a short time, of the motor function of a patient who has developed cranial nerve disorder. This information processing device is characterized by being provided with: a center of gravity trajectory calculation unit (401) which calculates a set of center of gravity trajectory data when a subject moves their center of gravity to the front/rear; and a motor function evaluation unit (403) which calculates, as an evaluation value and from the set of center of gravity trajectory data, the distance reached in the front/rear direction which is the distance between the maximum position reached in the front direction and the maximum position reached in the rear direction, calculates, as an evaluation value, the weighted center trajectory length in the right and left directions per unit time, and evaluates the motor function of the subject on the basis of said evaluation values.
MOTOR FUNCTION EVALUATION SYSTEM, INFORMATION PROCESSING DEVICE, AND INFORMATION PROCESSING METHOD