A network system and a method for controlling the same include where a power consumption amount of an electrical appliance is monitored based on an operation of the electrical appliance. If a demand response (DR) signal for requesting power saving is received, it is determined whether a user is to participate in a DR event for a power-saving operation of the electrical appliance. If it is determined that the user is to participate in the DR event, the power-saving operation of the electrical appliance is performed based on previously mapped information on a discomfort caused by the power-saving operation of the electrical appliance.