Using a three-dimensional medical image representing a chest region of a subject, enabling highly accurate pulmonary image diagnosis by considering the association with a branch structure (e. g., bronchus) . From a three-dimensional medical image, lung field area extraction unit (31) extracts a lung field area and bronchus extraction unit (32) extracts a bronchus area. Then, for each of a plurality of bronchus local sub-areas obtained by dividing a bronchus local area representing a portion of the bronchus area, attention lung field sub-area estimation unit (34) estimates a lung field local sub-area in the lung field area functionally associated with each divided branch structure local sub-area based on the branch structure area, pulmonary evaluation value calculation unit (35) obtains a pulmonary evaluation value in each estimated lung field local sub-area, and display control unit (36) displays, in a morphological image representing morphology of at least a portion of the branch structure local area generated from the three-dimensional medical image, the pulmonary evaluation value in each lung field local sub-area functionally associated with each branch structure local sub-area in the morphological image superimposed such that correspondence relationship between the pulmonary evaluation value and the branch structure local sub-area in the morphological image is visually recognizable.
