[Problem] To display a three-dimensional image that does not look awkward even when an artificial object is displayed when displaying a three-dimensional radiation image using a right-eye radiation image and a left-eye radiation image. [Solution] An artificial object is automatically extracted from a right-eye radiation image and a left-eye radiation image by means of image recognition. The position, in the depth direction, of the artificial object extracted by means of an artificial object extracting unit (8c) is determined by means of a position determining unit (8d) on the basis of the amount of parallax in the right-eye and left-eye radiation images. The brightness of the artificial object extracted by means of the artificial object extracting unit (8c) is adjusted by means of an image processing unit (8e) such that the brightness during display becomes lower the more the position determined by means of the position determining unit (8d) is in the depth (to a side that is away from an observer). The right-eye and left-eye radiation images of which the brightness are adjusted as mentioned above are displayed on a monitor (9).[Problème] Afficher une image tridimensionnelle ne présentant pas un aspect incommode même lorsquun objet artificiel saffiche pendant laffichage dune image radiologique tridimensionnelle utilisant une image radiologique doeil droit et une image radiologique doeil gauche. [Solution] Un objet artificiel est automatiquement extrait dune image radiologique doeil droit et dune image radiologique doeil gauche par un procédé de reconnaissance dimage. Dans le sens de la profondeur, la position de lobjet artificiel extrait au moyen dune unité dextraction dobjet artificiel (8c) est déterminée au moyen dune unité de détermination de position (8d), sur la base de la valeur de parallaxe des images radiologiques doeil droit et doeil gauche. La brillance de lobjet artificiel extrait au moyen de lunité dextraction dobjet artificiel (8c) est réglée au moyen d
