1. A multi-view video encoding method comprising: encoding a multi-view image included in a multi-view video; multiplexing the encoded multi-view image by a predetermined data unit; and adding a scalable extension type (SET) indicating which view of image among a basic view image and an additional view image is related to data included in the predetermined data unit, a depth flag indicating which image is related to the data among a texture image and a depth map image, and a view identifier (ID) of the data to a header of the predetermined data unit.