1. An image processing method comprising: receiving three-dimensional (3D) image data; generating additional information about the 3D image data; and inserting the additional information in a user data area related to the 3D image data, wherein the user data area comprises a data island interval of a blanking interval, and the generated additional information comprises a parameter which defines an interface for displaying the 3D image data on a two-dimensional (2D) image display apparatus.