An image frame input unit receives the input of image frames. An insertion unit inserts a plurality of markers into the image frame thus inputted. Each of the plurality of markers is defined as a pattern that is not scheduled to appear in data of the image frame. At this time, the insertion unit divides the image frame into a plurality of parts based on a data size storable in a radio packet, and inserts the markers among the divided parts of the image frame. An RF unit outputs the image frame into which the plurality of markers have been inserted.

 
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