A method of controlling operations of a participating controlled device in a network that includes a control device and the participating controlled device, the method including: receiving operation limiting information from the participating controlled device, the operation limiting information including combinations of allowed operations from among a plurality of operations that the participating controlled device is capable of performing, and power consumption levels that are relative amounts of power consumption of the combinations of allowed operations; setting a power consumption level corresponding to the participating controlled device, from among the power consumption levels, based on information regarding time-based price and the operation limiting information; and controlling the operations of the participating controlled device based on the set power consumption level.