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 data collection module to obtain predicted environmental data including weather information regarding a target control area; a system setting module to set facility information relating to at least one facility within the target control area; and an energy usage simulation module to model the facility based on the facility information and to simulate a power consumption of the facility according to a control scenario, wherein the energy usage simulation module includes: an energy reduction calculation module 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.