A method for controlling a display device, the method comprising: displaying a content on a main screen (4110; 4120) of the display device; entering an enlargement mode in accordance with an input for requesting the enlargement mode, which is received from a remote controller; receiving an input for selecting a specific area from an entire area, which is displayed on the main screen, from the remote controller; enlarging the selected specific area at a predetermined magnification in accordance with the received selection input; displaying the enlarged specific area on the main screen; displaying first detailed information of the enlarged specific area differently according to the predetermined magnification on a first area of a PIP screen within the main screen; displaying second detailed information on a second area of the PIP screen; displaying third detailed information on a third area of the PIP screen; in response to receiving an input for selecting the first detailed information from the remote controller, displaying the first detailed information on the main screen, displaying the second detailed information on the first area of the PIP screen where the first detailed information has been already displayed, displaying the third detailed information on the second area of the PIP screen where the second detailed information has been already displayed, wherein the second detailed information is related to the first detailed information and provides more detailed information than the first detailed information, wherein the third detailed information is related to the second detailed information and provides more detailed information than the second detailed information, and wherein the content includes video, map information, EPG information or information about a performance. displaying a content on a main screen (4110; 4120) of the display device; entering an enlargement mode in accordance with an input for requesting the enlargement mode, which is received from a remote controller; receiving an input for selecting a specific area from an entire area, which is displayed on the main screen, from the remote controller; enlarging the selected specific area at a predetermined magnification in accordance with the received selection input; displaying the enlarged specific area on the main screen; displaying first detailed information of the enlarged specific area differently according to the predetermined magnification on a first area of a PIP screen within the main screen; displaying second detailed information on a second area of the PIP screen; displaying third detailed information on a third area of the PIP screen; in response to receiving an input for selecting the first detailed information from the remote controller, displaying the first detailed information on the main screen, displaying the second detailed information on the first area of the PIP screen where the first detailed information has been already displayed, displaying the third detailed information on the second area of the PIP screen where the second detailed information has been already displayed, wherein the second detailed information is related to the first detailed information and provides more detailed information than the first detailed information, wherein the third detailed information is related to the second detailed information and provides more detailed information than the second detailed information, and wherein the content includes video, map information, EPG information or information about a performance.