A method for displaying an image in a multi-display device having two or more displays disclosed in the present invention comprises: a step of determining whether there is a boundary region image to be displayed including a boundary region between a first display device and a second display device among images; and a step of playing back the boundary region image such that the boundary region image is displayed while the size thereof is increased, by generating and inserting dummy data at a position corresponding to the boundary region in the boundary region image.
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