The system includes a storage including records created for every product at
every stage and a processor operated by first and second processes. Each record
includes a first stage information at which the food product is processed, a first
time information for specifying the time period of processing at the first stage,
a second stage information at which the livestock product processed at the first
stage is received as material and a second time information for specifying the
time period of processing at the second stage. The first process specifies a target
record whose first stage and time information are coincident with that of an original
product. The second process specifies a new target record whose first stage and
time information are coincident with the second stage and time information of the
previous target record. The second process is repeated until a new target record
cannot be specified.
