7. A three-dimensional (3D) display apparatus comprising: a signal receiving unit for receiving a broadcast signal including 3D caption data based on a code space; a caption decoding unit for decoding the caption data to acquiring 3D command and caption text from the 3D caption data, wherein the 3D command is delivered in a C3 code set contained in the code space, wherein the C3 code set is accessed by using an ‘EXT1’ code in a base code set, wherein the 3D command provides disparity data which applies to a caption window; and a processing unit for processing the disparity data and the caption text such that the caption text is written to the caption window for 3D captioning.
7. A three-dimensional (3D) display apparatus comprising: a signal receiving unit for receiving a broadcast signal including 3D caption data based on a code space; a caption decoding unit for decoding the caption data to acquiring 3D command and caption text from the 3D caption data, wherein the 3D command is delivered in a C3 code set contained in the code space, wherein the C3 code set is accessed by using an ‘EXT1’ code in a base code set, wherein the 3D command provides disparity data which applies to a caption window; and a processing unit for processing the disparity data and the caption text such that the caption text is written to the caption window for 3D captioning. 8. The apparatus of claim 7 , wherein the caption data is formatted within picture user data, and wherein the picture user data is inserted at any of Sequence level, Group of Pictures (GOP) level, and Picture Data level.