To provide a component registration data development system by which only a small quantity of inputted data is required, time required for input is shorten and confirmation of erroneous input is facilitated.

A display means 2 displays a table part for slip type data input and a person inputting data inputs pieces of data corresponding to the respective input columns of the table part by using an input means 3. The pieces of data to be inputted in the table part are component call codes, the minimum value, the maximum value of dimensional data of the components to constitute 'catalog Nos.' in addition to the component call codes and an interval value, etc., for calculating the dimensions to be set between the maximum and minimum values, a processing means 1 successively calculates pieces of the dimensional data by every kind from pieces of data about the maximum value, the minimum value and the interval value in the case of a development processing of component registration data, generates the catalog members by combining the calculated pieces of dimensional data and the component call codes and outputs a component registration data file F1 developed by arranging the respective catalog numbers and the calculated pieces of dimensional data, etc., in a prescribed order.