1. An image processing apparatus comprising: a generation unit configured to acquire a single three-dimensional magnetic resonance (MR) image of patient anatomy including both left and right breasts of the patient; project said three-dimensional MR image data to generate at least two two-dimensional images which respectively represent the left and right breasts of said patient; and generate a comparison two-dimensional composite MR image of the left and right breasts for comparison to a composite X-ray mammography image having symmetrically disposed left and right breast images therewithin, wherein the two-dimensional left and right breast MR images are disposed symmetrically in the comparison two-dimensional composite MR image like those in the X-ray mammography image; and a display control unit configured to display the comparison two-dimensional image on a display unit.