[Objective] To enable the display of a label added to a three-dimensional image to be controlled without imposing the burden on a user. [Constitution] A label adding unit (16) adds labels to structures such as a body surface region, a lung region, bronchi, and pulmonary nodules of a human extracted by a structure extraction unit (14) from a three-dimensional image (V0) of a chest. An image display control unit (18) displays the three-dimensional image V0 by volume rendering on a display unit (26). At this time, a label display determination unit (20) determines at least one label to be displayed with the volume rendering image to be displayed based on the opacity during the volume rendering display. A label display control unit (22) displays the determined label with the volume rendering image on the display unit (26).
