An ultrasound diagnosis apparatus: in conjunction with change of a projection region using an operation part, changes a viewpoint to a position where a reference cross section is in front and the changed projection region is on the back in conjunction with change of the viewpoint using the operation part, changes a region where the reference cross section is in front and the changed viewpoint is on the back to the projection region in conjunction with change of a scanning region using the operation part, changes the viewpoint to a position where the reference cross section is in front and the changed scanning region is on the back in conjunction with change of the viewpoint using the operation part, changes the scanning region to a region where the reference cross section is in front and the viewpoint is on the back and then executes rendering.
