A network system is provided. The network system includes an utility area network including an energy generation component, a home area network including an energy consumption component consuming energy generated in the energy generation component to perform a function according to an operation course, an energy metering component disposed in the utility area network or the home area network, the energy metering component recognizing energy information or additional information except for the energy information, and an energy management component disposed in the utility area network or the home area network, the energy management component managing the energy information or the additional information with respect to the energy consumption component. The energy consumption component includes a control unit for controlling an operation of at least one course component constituting the operation course to restrict the operation of the one course component based on the energy information or the additional information.