A display device is disclosed. The display device according to the present invention comprises: a display; a sensor for detecting the distance between a user and the display device; a sub-processor for receiving a detection signal from the sensor when the user exists in a first area among a plurality of areas classified according to distances with reference to the display device; and a processor which, when the sub-processor receives the detection signal from the sensor in a state where the sensor and the sub-processor are activated, is activated by the sub-processor to update a content, and when it is determined that the user is located in a second area among the plurality of areas, on the basis of the distance between the user and the display device, controls the display such that the display, which is in an inactive state, is activated to display the updated content.