| 摘要 |
<p>A process controller (3a) so provided as to be related to a process records date/time information on the date/time when a product is inputted to the related process and on the date/time when the product is outputted from the related process in a recording medium attached to the product. The date/time information is related to identification information on the process before the recording. Thus, the enumeration data about the identification information on the process controller (3a) related to the process in which the product is processed and the input/output date/time information on the date/time when the product is inputted/outputted into/from the process is recorded in the recording medium. When the history of the processes that the product has undergone is needed, information on the processes that the processed product has undergone is collected by inquiring of the process controllers (3a) specified by the device identification information read from the recording medium about the processes after specifying the input/output date/time information read from the recording medium.</p> |
