A diagnosis imaging apparatus and an operation method thereof are provided. A diagnosis imaging apparatus includes: an image processing apparatus for detecting a first point and a second point on a heart wall of a valve of interest in a 3D volume data of a heart of a subject, rotating the 3D volume data to make a virtual line connecting the first point and the second point be parallel with a datum plane, and acquiring a 3D standard view of the valve of interest based on the rotated 3D volume data; and a display apparatus for displaying the 3D standard view.