Method of providing fixed region information or offset region information for subtitle in virtual reality system and device for controlling the same

An apparatus for providing subtitles for 360-degree content, the apparatus comprising:

• a processor configured to generate 360-degree video data captured by at least one camera;
• a stitcher configured to stitch the 360-degree video data;
• a projection processor configured to project the 360-degree video data to a 2D image;
• a data encoder configured to encode the 2D image into a video stream;
• a metadata processor configured to generate a 360-degree subtitle Supplemental Enhancement Information (SEI) message for signaling a subtitle for the 360-degree content, wherein the data encoder is further configured to insert the 360-degree subtitle SEI message into the video stream, the 360-degree subtitle SEI message including a subtitle ID for identifying the subtitle, a region ID for identifying a subtitle region where the subtitle is overlaid in a 360-degree space, and subtitle region information being fixed region information for specifying the subtitle region fixed in the 360-degree space or offset region information for specifying the subtitle region changing in the 360-degree space based on a viewport;
• a transport processor configured to generate a signal including the video stream;
• and
• a transmitter configured to transmit the signal.