A display apparatus and a method of providing a user interface (UI) thereof are provided. The method includes displaying at least one item in a first area of a display screen, when one of the at least one item is selected, displaying a first sub screen corresponding to the selected item in a second area of the display screen and displaying at least one first lower item of the selected item, and when one of the at least one first lower item is selected, displaying a sub screen corresponding to the selected first lower item to overlap with at least a part of the first sub screen.