To enable follow-up check of information on the quality of products for every process without using a large capacity storage device.

This system is provided with production lot information recording files 14-44 for recording a lot number and lot information inputted corresponding to each process for every process, and recording the lot number of the precious process of each of all processes other than the first process by making it correspond to the lot number of the process, and a serial information recording file 53 for recording a serial number applied to each part manufactured in the first process, the lot number of the first process, and the lot number of the last process by making them correspond to each other. An information follow-up control means 5 retrieves the lot number of the first process and the lot number of the last process from the serial information recording file, and successively retrieves the lot number of the previous process from the lot information recording files based on the lot numbers. Thus, the information of the product of the serial number can be extracted across the whole processes.