1. A control apparatus comprising: a controller to control facilities or equipment; and a display device to display information on a screen, wherein the controller includes a processor to: obtain predicted environmental data including weather information regarding a target control area, set facility information relating to at least one facility within the target control area, and model the facility based on the facility information and to simulate a power consumption of the facility according to a control scenario, wherein the processor to determine an energy reduction rate of the facility or the target control area based on a simulation result relating to the power consumption of the facility model according to a combination of at least one control scenario, wherein the processor to determine a combination of at least one control scenario based on the energy reduction rate input at an input device, wherein the control scenario is at least one set of control commands having a sequence.