The purpose of the present invention is to achieve a suitable evaluation method for the quality of a patent publication such as a description. A claim term frequency distribution generation unit (41)separates the content of the claims of a patent published in a gazette into individual terms and generates a claim term frequency distribution indicating the frequency distribution of each separated term. A description term frequency distribution generation unit (42) separates the content of the description of the patent published in a gazette into individual terms and generates a description termfrequency distribution indicating the frequency distribution of each separated term. A description synonym frequency distribution generation unit (43) sorts the individual terms extracted from the description into a plurality of groups corresponding to each of the plurality of terms from the claims and generates a description synonym frequency distribution indicating a frequency distribution in which each of the sorted plurality of groups serves as a unit. An evaluation information generation unit (44) generates evaluation information on the basis of the claim term frequency distribution andthe description term synonym frequency distribution.