1. A method of a multidimensional content providing system for providing a user with a multidimensional content including a 2D video section and a 3D video section, comprising steps of: (a) the multidimensional content providing system recognizing either piece of information on starting points and information on ranges of sections with respect to the 2D video section and the 3D video section, respectively; (b) the multidimensional content providing system acquiring a distorted image generated by playing the 3D video section through a 2D player, wherein frames included in the 3D video section are determined by referring to either piece of the information on starting points and the information on ranges of sections with respect to the 2D video section and the 3D video section, respectively; and (c) the multidimensional content providing system providing, or supporting to provide, a video content including (i) the 2D video section and (ii) a section acquired by applying a rendering process to the distorted image through a rendering engine, wherein the step of (c) includes the step of: performing a dimension conversion process for frames within a predetermined scope from a boundary between the 2D video section and the 3D video section, and wherein the dimension conversion process is applied to give fade-in or fade-out effects for the 2D video section and the 3D video section within the predetermined scope from the boundary.