[Problem] To make it possible, in an image processing device, and operation method and program for said device, to easily ascertain what anatomical region a point under consideration in a tree-structure human body structure is, or what kind of anatomical structure there is around said point. [Solution] According to the present invention: a target point is set in a human body structure region of a three-dimensional image obtained by photographing a tree-structure human body structure the tree structure of the human body structure is acquired and a pathway from a reference point that is set further upstream in the branch of the target point in the tree structure to the target point is determined an initial image representing only the pathway portion of the entire human body structure, and images for confirmation for each step, said images sequentially representing the portions of the human body structure excluding the abovementioned pathway in accordance with an order of priority decided on the basis of the positional relationships between said portions and the target point, are generated from the three-dimensional image and after the initial image is displayed, the images for confirmation are displayed such that the portions of the human body structure excluding the abovementioned pathway are sequentially displayed in accordance with an order of priority decided on the basis of the positional relationships between said portions and the target point.La présente invention vise à permettre de vérifier facilement, dans un dispositif de traitement dimage, un procédé de fonctionnement et un programme pour ledit dispositif, quelle région anatomique représente un point à examiner dans une structure arborescente de corps humain, ou quel type de structure anatomique se trouve autour dudit point. Selon la présente invention : un point cible est défini dans une région de structure de corps humain dune image tridimensionnelle obtenue par photographie dune structure arborescente d
