1. A stereoscopic image processing method for creating a single processed stereoscopic combined image formed by arranging a plurality of view-point images, the method comprising: determining whether a ratio V/H between a vertical size V and a horizontal size H of an original stereoscopic combined image satisfies a condition V/H ≦2/3; and upon determining that the ratio between the vertical size V and the horizontal size H of the original stereoscopic combined image does not satisfy the condition, adding a padding area having at least one of any color and any pattern to the original stereoscopic combined image to create the processed stereoscopic combined image with a horizontal size H1 and a vertical size V1, wherein the padding area is added to the original stereoscopic combined image in such a way as to satisfy the condition of V1>V and also to satisfy the condition that the ratio between V1 and H1 falls within a predetermined ratio range.