Provided is a system for evaluating the degree of foot drop. An information processing device according to the present invention is provided with: an acquiring means for acquiring a measurement result obtained by measuring the foot-pressure distribution of a subject an identification means for identifying the healthy-side foot and the paralyzed-side foot of the subject by calculating the surface area of rear foot sections of the feet of the subject on the basis of the measurement result a projection means which calculates a circumscribed rectangular shape of the rear foot section of the foot identified as the healthy side by the identification means, and projects said circumscribed rectangular shape onto the rear foot section of the foot identified as the paralyzed side a centre-of-gravity-position calculating means for calculating the centre-of-gravity position of the foot identified as the paralyzed side by the identification means and a degree-of-foot-drop calculating means for calculating the degree of foot drop by calculating the centre-of-gravity position relative to the circumscribed rectangular shape projected by the projection means.Linvention concerne un système permettant dévaluer le degré de chute du pied. Un dispositif de traitement dinformations selon la présente invention est pourvu des éléments suivants : un moyen dacquisition permettant dacquérir un résultat de mesure obtenu par la mesure de la distribution de pression du pied dun sujet un moyen didentification permettant didentifier le côté sain du pied et le côté paralysé du pied du sujet par le calcul de la zone de surface de sections de pied arrière des pieds du sujet sur la base du résultat de mesure un moyen de projection qui calcule une forme rectangulaire circonscrite de la section de pied arrière du pied identifié comme le côté sain par le moyen didentification, et qui projette ladite forme rectangulaire circonscrite sur la section de pied arrière du pied identifié comme le côté paralysé
