PURPOSE: To effect a control based on a set operation schedule when it has become the specified day of week by a method wherein the operation schedule, specifying and changing the specified day of week, is set and the carry-out of these schedules is commanded.

CONSTITUTION: When the day of week is specified by a switch "specifying of the day of week by K1" in a key board KB, then, the times of starting and stopping are inputted by ten keys or the like in the key board KB, "setting of operating schedule" which is to be changed is set and the same operations are effected (n) times with respect to the different days of week if necessary, thereafter, the carry-out of the shedule is commanded by the carry-out commanding switch of the key board KB named as "carry-out commanding by Kp", these data are stored in a variable memory RAM. A time counting and the decision of the day of week are effected by a time counting circuit in a processor CPU, and when the decision of "specified day of week?" is Y(YES) by collating with the data of the variable memory RAM, "there is carry-out command?" is decided by the decision whether the data, corresponding to "carry-out command by Kp," are existing in the variable memory RAM or not, and if it is Y, the operation "changed operation control by the operation schedule of the specified day of week" is effected in accordance with the data in the varible memory RAM.