A functional image generating section that generates a functional image that represents the functions of a subject, based on 3D medical image data obtained by imaging the subject a projected 3D image generating section that generates a projected 3D image that represents the appearance of the subject, based on the 3D medical image data a display control section that displays the functional image and the projected 3D image and a specified position data obtaining section that obtains position data regarding a position specified within the functional image, are provided. The projected 3D image generating section generates the projected 3D image which is projected in a projection direction such that a position within the projected 3D image corresponding to the specified position faces forward, based on the position data. The display control section displays the projected 3D image having the projection direction.
