A display control system using a knob includes an input part which receives at least one piece of position information of a knob within a movement range in an area under a display and position information of the knob within a preset plane area, a memory in which a display control program using the position information of the knob is stored, and a processor which executes the program, and the processor controls a function in a vehicle in consideration of the position information according to movement of the knob and operation information of the knob.