To raise production efficiency when equipment is repeatedly used for the same produce (for example, semiconductor wafer lot) and the same equipment is used for mixed production of different products.

Related to a production control method for such production line wherein at least one of equipment is a branch-output type equipment comprising a plurality of next processes where a post-process product is fed, when a plurality of products are in-process at the branch-output type equipment, a total process time for current in-process products is calculated for each device in charge of the next process, and based on the calculation result, priority of products processed with the branch-output type equipment is decided, with the shortest expected process time at first (S7).