1. A method for automated landmark extraction from three-dimensional whole body scanned data, the method comprising: using a computer to perform the steps of: extracting feature points as landmarks on the human body; directly extracting intersection of neck and shoulder, acromion, chest line, hip line, and rearmost of hip based on three-dimensional changes in shape of the body without premarking landmarks prior to scanning; utilizing silhouette analysis by projecting the three-dimensional whole body scanned data onto a coronal plane to extract an intersection of the neck and shoulder by locating locally minimum points on silhouette curves; and extracting the intersection of the neck and shoulder at a point between a neck top and the acromion with a maximum vertical distance to a line connected by the neck top and the acromion.