1. A method of providing a by-viewpoint patent map, the method comprising: searching patent documents to which by-viewpoint classification codes are assigned, wherein a plurality of classification titles are assigned to the by-viewpoint classification codes, and the plurality of classification titles relate to a plurality of technical fields; extracting the by-viewpoint classification codes from the searched patent documents; classifying the searched documents by the by-viewpoint classification codes; grouping the by-viewpoint classification codes into a first viewpoint and a second viewpoint; grouping the plurality of classification titles into a plurality of rearranged classification titles, wherein the number of the plurality of rearranged classification titles is smaller than the number of the plurality of classification titles, and the plurality of technical fields are reflected on the plurality of rearranged classification titles; generating a by-viewpoint patent map based on the plurality of rearranged classification titles assigned to the by-viewpoint classification codes; and displaying the generated by-viewpoint patent map.