A method for controlling a television, the method comprising: displaying video content including at least one object on a main screen, wherein the video content corresponds to a broadcast program; entering an enlargement mode in accordance with an input requesting the enlargement mode received from a remote controller (610; 620; 630); displaying a guide line (3814; 3822) indicating a boundary of an object of the at least one object while the video content is displayed when a pointer (3716; 3812) associated with the remote controller (610; 620; 630) is located within a predetermined distance from the object; selecting the object within the indicated boundary as the specific object in response to a selection input; displaying an enlarged specific area of the video content on the main screen, wherein the enlarged specific area includes the specific object; changing the enlarged specific area to include the specific object when a position of the specific object within the video content is changed; displaying (S3660, S3670) a window at a portion of the main screen, the window comprising a view of the video content and an indicator indicating a position of the displayed enlarged specific area within the view of the video content; receiving, from the remote controller, an input selecting, in the displayed enlarged specific area, another object of the video content different from the specific object; displaying an additional selection message in response to receiving the input selecting the another object; in response to receiving an additional selection input from the remote controller, grouping and tracking the specific object and the another object; displaying an enlarged specific area of the video content including the specific object and the another object. displaying video content including at least one object on a main screen, wherein the video content corresponds to a broadcast program; entering an enlargement mode in accordance with an input requesting the enlargement mode received from a remote controller (610; 620; 630); displaying a guide line (3814; 3822) indicating a boundary of an object of the at least one object while the video content is displayed when a pointer (3716; 3812) associated with the remote controller (610; 620; 630) is located within a predetermined distance from the object; selecting the object within the indicated boundary as the specific object in response to a selection input; displaying an enlarged specific area of the video content on the main screen, wherein the enlarged specific area includes the specific object; changing the enlarged specific area to include the specific object when a position of the specific object within the video content is changed; displaying (S3660, S3670) a window at a portion of the main screen, the window comprising a view of the video content and an indicator indicating a position of the displayed enlarged specific area within the view of the video content; receiving, from the remote controller, an input selecting, in the displayed enlarged specific area, another object of the video content different from the specific object; displaying an additional selection message in response to receiving the input selecting the another object; in response to receiving an additional selection input from the remote controller, grouping and tracking the specific object and the another object; displaying an enlarged specific area of the video content including the specific object and the another object.