1. A method of providing a multiview still image service, the method comprising: configuring a multiview still image file format comprising a plurality of image areas; inserting a plurality of pieces of image information corresponding to a multiview still image into the plurality of image areas, respectively; inserting three-dimensional (3D) basic attribute information to three-dimensionally reproduce the multiview still image into a first image area of the plurality of image areas; and outputting multiview still image data comprising the plurality of pieces of image information based on the multiview still image file format wherein main-view image information from among the plurality of pieces of image information is inserted into the first image area.