A 6DoF video data processing method performed by a 6DoF video transmission device according to the present invention comprises the steps of: acquiring information on pictures of a 6DoF video and metadata of the 6DoF video; decoding the pictures on the basis of the metadata and the information of the pictures, and deriving an image of a user position; and processing the image on the basis of the metadata, and performing rendering into a 3D space around the user position, wherein the metadata includes stitching information and information of a camera having captured the 6DoF video.