The present invention relates to a display apparatus comprising a display part which displays a main image and a sub image thereon, further comprising a user selection part having a menu adjusting button, such as a button; and a processor to adjust a display state of the sub image by a selection of the menu adjusting button if the display part displays the main image and the sub image thereon, and to adjust a predetermined menu by the selection of the menu adjusting button if the display part does not display the sub image thereon. Thus, the present invention provides a display apparatus to change a display state of a sub image without difficulty and a control method thereof.