The present invention is to provide a control system, which includes a plurality of switch devices each electrically connected between an electrical appliance and a power supply unit for turning on or off the electrical appliance, and a processing server respectively connected to the switch devices and capable of turning the switch device into a turned-on or turn-off state at a predetermined time according to a time schedule stored therein. In addition, the processing server can generate an exception time data when determining an exceptional condition (e.g., a specific event took place, a user did not leave home on time, or the user turned on the electrical appliance on his or her own initiative) occurs, and then change the state of each switch device preferentially according to the exception time data, so as to adjust the time schedule in a timely manner upon determining the occurrences of different exceptional conditions.