Abstract: Provided are a network system and a method of controlling the same. The network system includes a metering device metering energy supplied from a power supply source, a communication device by which energy information related to the energy communicates, an energy management device recognizing the energy information to control an operation of an electric product, and an environment information management device recognizing a carbon amount or a carbon dioxide amount, which is generated according to the operation of the electric product. A power-saving operation of the electric product is selectively performed, based on the carbon amount or the carbon dioxide amount recognized by the environment information management device. Since a power management program is executed using an environment information management unit, energy may be further efficiently managed within an intellectual power supply network.