An electronic device and a control method thereof are disclosed, the electronic device including: an operation implementation unit conducting a predetermined operation; a first main controller controlling the operation of the operation implementation unit; an input reception unit receiving an input signal; a second main controller processing the input signal and being in the power saving state in the standby mode; and a subcontroller controlling the second main controller to process the input signal when the input signal is received in the standby mode, wherein the second main controller processes the received input signal according to control of the subcontroller, controls the first main controller to operate in the normal mode when the input signal corresponds to entering the normal mode, and returns to the power saving state in the standby mode when the input signal does not correspond to entering the normal mode.