To make a manufacturing hour so as to be findable so accurately without setting up a model.

An operation part 7 judges a fact of whether an identification code in the operational item is a scheduled pausal one or not, and when it is this scheduled pausal code, a pause predetermined time to be prescribed by the identification code is added to a rolling predetermined hour, and when it is not the pausal scheduled code, rolling information being concerned in the identification code is read out of a rolling information data base 12, thereby judging a group code on the basis of the read rolling information. In succession, the operation part 7 reads a rolling pitch to be concerned in the judged group code from a rolling pitch memory 3, and they this read rolling pitch is added to the rolling predetermined hour.