A production system and a production method, which can change a period to delivery of products flexibly depending on a change of demand, in the case of producing a plurality of products having different specifications by mixing. A production system of plural kinds of products has a plurality of lower processes, which is capable of diverging, with respect to an upper process that can be applied common in a plurality of products. These upper process and lower process are organized by including one or a plurality of processes. A production line is constructed by a plurality of manufacturing facilities having different functions through the upper process and the lower process. Such a production system is provided with an order and delivery management system, a design management system, and a process management system.