To display a key phrase in a document by a display attribute according to a category.
A document storage 11 stores a document of reading object. A text extraction part 12 extracts a content text from each page of the document of the reading object. The extracted text is stored in a text storage 13 by page as a file. A unique expression extraction part 14 receives a text file for each page from the text storage part 13; extracts a unique expression included in the text file; outputs unique expression information including the category, a unique expression character string, positional information, or the like of the unique expression; and stores the unique expression information in a unique expression storage part 15. A display control data storage part 17 stores a color for displaying for each category. A display data generation part 16 under the control of a display control part 18 generates display data accompanying classification-by-color information to be displayed on a display unit 19. The display unit 19 displays the document by page and distinguishes a unique expression appearance part by color according to the category thereof.
NAGAMINE TAKESHI
YOSHIJI KATSUNORI
Masaaki Miyata
Eiji Yamada
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