To perform speedy and detailed control of a distributed power supply, and to stably supply power by the distributed power supply.

In each distributed power supply 3, measurement command devices 10 for taking charge of each measurement and control are connected mutually communicably. The measurement command devices 10 acquire a current frequency of a power system 2 and current output of own equipment, acquire current output of other equipment from each of other measurement command devices 10, generate a command value for controlling each output of the distributed power supply 3, based on the current frequency of the power system 2, the current output of the own equipment, and current output of the other equipment, obtain a transfer function between the command value and output, based on the command value and the output accumulated and stored for the distributed power supply 3 that cannot acquire the current output of the other equipment when at least one or more current outputs of the other equipment cannot be acquired, estimate the current output of the other equipment, which cannot be acquired, based on the obtained transfer function, and use the estimated current output of the other equipment to generate the command value.