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 included in the predetermined data unit, a depth flag indicating whether a data included in the predetermined data unit is a texture image or a depth map image, and a view identifier (ID) of the data to a header of the predetermined data unit, wherein when the SET indicates that the data included in the predetermined data unit is the basic view image, a temporal identifier of the basic view image is added to the header of the predetermined data unit instead of the view identifier.