Disclosed are a method for controlling a device including at least one memory, and a smart TV. The method comprises the steps of: receiving, from a remote controller, a signal for executing at least one application; outputting video data and audio data of the executed application; temporarily storing the executed application in an internal memory; swapping, to an external memory, a page corresponding to a specific application of the at least one application stored in the internal memory; and displaying information on the application swapped to the external memory.