Importance

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Abstract

With a structure of preparing a process step management apparatus (3a) corresponding to a process step, the date and time information on the input of a product to the process step of the process step management apparatus and the date and time information on the output of the product from the process step of the process step management apparatus are recorded on a record medium attached to the product while maintaining the correspondence to the identification information on the process step management apparatus. Thus, the enumerated data of the identification information on the process step management apparatus (3a) corresponding to the process step in which the product is handled, and the date and time information on the input and output of the product in the process steps is recorded on the record medium. When the processing history of the product is required, the processing information on each process step of the product to be handled can be collected by issuing inquiries to each process step management apparatus (3a) pointed to by the device identification information read from the record medium with the date and time information on input and output of a product read from the record medium specified.

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First Claim