A program for a control terminal to control output power of a power generation system, the power generation system including a plurality of power generators and a plurality of power generation controllers to control output power generation levels of the plurality of power generators, the program being executable to perform operations comprising:
- obtaining a power consumption level of a load;
- obtaining a total allowable power generation level of the power generation system;
- determining whether the total allowable power generation level of the power generation system decreases or increases with respect to the total allowable power generation level at a time (t=t0) in a preceding cycle by calculating the total allowable power generation level based on the power consumption level and a total power generation level of the plurality of power generators;
- calculating, based on a result of the determining, an output command value at a current time (t=t1) for each of the plurality of power generation controllers.