To obtain an excellent control result in a transient state due to a brand change and to improve the yield by setting a control set value and a manual operation output value in the transient state by using optimum data on a combination of the brand change.

A use data selecting device 9 selects optimum information corresponding to a combination number stored in an optimum data storage device 8 out of pieces of optimum information in the transient state with the combination number according to a brand combination number to be used next time and the specification of a day and time. The data are set in time series in a hold area 10 for control set value/operation output value setting and a brand data update timer 15 is actuated with a brand change command. Then, while the control set value and operation output value held in the control set value/operation output value setting hold area 10 are updated by data update devices 11a and 11b in synchronism with a timer clock signal, the output of the set value of a controller 1 and the output of a manual operation unit 2 is set.