The present invention relates to an electronic control system for a vehicle and a control method thereof, wherein communication is made between a main controller and at least one local controller to control a brake apparatus and a suspension apparatus in consideration of information of the controllers, thereby further improving and activating unique features of the respective controllers as well as simplifying the system. An embodiment of the present invention provides an electronic control system for a vehicle having a main controller for receiving vehicle information and creating and outputting a brake control signal and a suspension control signal for a vehicle; at least one local controller for controlling a damper of each wheel according to the suspension control signal outputted from the main controller; and an interface unit for performing data communication between the main controller and the local controller.