A method of operating a 3D ultrasound system, the method including generating a first volume image and a second volume image of an object by using ultrasound signals determining a first anatomical plane and at least one second anatomical plane that is different from the first anatomical plane from each of the first volume image and the second volume image matching polygonal templates to the at least one second anatomical plane of each of the first volume image and the second volume image and overlapping axis of the first anatomical planes of the first volume image and the second volume image and overlapping the first volume image and the second volume image based on energy of a polygonal template matched to the at least one second anatomical plane of the first volume image and energy of a polygonal template matched to the at least one second anatomical plane of the second volume image.
