The present specification discloses various embodiments for a digital device and a control method thereof. Herein, a control method of a digital device according to an embodiment of the present invention may comprise the steps of: receiving a power-on signal; determining whether an application, which was executed at a power-off time point before the reception of the power-on signal, was an image output application; if it is determined that the application which was executed at the power-off time point was an image output application, loading and executing the image output application; loading and executing a first image control application for controlling an image that is output through the image output application; loading a second image control application; and, when the loading is completed, terminating the first image control application and executing the second image control application.