To make easily verifiable the whole of a plant, to make easily performable efficient plant expansion in the case of newly rising a production line or process change of an existent line in a short time and to make appropriately performable the remote monitor of a constructed plant.
A virtual plant is prepared by making a partially or entirely newly designed plant into data model. The production condition and physical distribution condition are verified by making the virtual plant perform production simulation by a simulation means. A real plant matching with the verified virtual plant is constructed. The constructed real plant is remotely monitored and the monitored result is compared with the verified result in the virtual plant verification process.