Provided is a diagnostic support program that can display the movement of an area that changes shape with each respiration element that includes all or part of an inhale or an exhale. The program includes: processing in which a plurality of frame images are acquired from a database that stores images; processing in which the period of a respiration element that includes all or part of an inhale or an exhale is specified on the basis of the pixels in a specific area of the frame images; processing in which a lung field is detected on the basis of the specified period of the respiration element; processing in which the detected lung field is partitioned into a plurality of block areas, and the change in the block areas of the frame images are calculated; processing in which a Fourier transform is performed on the change in the block areas of the frame images; processing in which, of the spectra obtained after the Fourier transform, the spectra that are within a fixed band that includes the spectrum that corresponds to the period of the respiration element are extracted; processing in which an inverse Fourier transform is performed on the spectra extracted from the fixed band; and processing in which post-inverse-Fourier-transform images are displayed on a display.La présente invention concerne un programme d'aide au diagnostic qui peut afficher le mouvement d'une zone qui change de forme avec chaque élément de respiration qui comprend tout ou une partie d'une inspiration ou d'une expiration. Le programme comprend : le traitement dans lequel une pluralité des images de trame sont acquises dans une base de données qui stocke des images ; le traitement dans lequel la période d'un élément de respiration qui comprend tout ou une partie d'une inspiration ou d'une expiration est spécifiée sur la base des pixels dans une zone particulière des images de trame ; le traitement dans lequel un champ de poumon est détecté sur la base de la période spécifiée de l'élément de respirat