APPARATUS FOR DISPLAYING A PORTION TO WHICH DESIGN MODIFICATION IS MADE IN DESIGNING A PRODUCT

The present disclosure is directed to a technique that can be applied to a situation in which a single product is designed by multiple designers using a CAD. During a modification operation of feature data, portions that are referenced to are accumulated in a referenced portion accumulation unit. A portion that has been modified is obtained from new and old feature data, and a determination is made as to whether a reference to the modified portion has been made, based on the information accumulated in the referenced portion accumulation unit. Information about the modified portion that is determined as having been referenced to is displayed on a display.