Abstract: A highly precise synonym determination is performed, and a synonym dictionary is automatically created from a text. The text is segmented into multiple words. A topic classification is carried out, a topic word is selected from the multiple words, and a reference word characterizing each topic is extracted from the topic word. Multiple vectors respectively expressing the multiple words are obtained. A similar word is selected from the multiple words, such that the similarity between the vector expressing the reference word and the vector expressing each similar word exceeds a set reference. The synonym dictionary is created in which at least a part of the similar word has been registered.

Abstract: A data converter (811) rasterizes vector data indicating an entirety of each of patterns to generate drawing raster data, and generates partial raster data which is raster data indicating a feature area for pattern identification in each of the patterns at the time of generating the drawing raster data. A set of the drawing raster data and the partial raster data is treated as a drawing data set (51), and a plurality of drawing data sets (51) respectively corresponding to a plurality of patterns are stored in a memory (821). A display controller (601) causes an image showing a feature area in a selected pattern out of the plurality of patterns to be easily and speedily displayed on a display (602), based on the partial raster data included in the same drawing data set (51) that includes the drawing raster data indicating the selected pattern.