Material retrieval apparatus, document retrieval system, document retrieval method, and program

摘要

PROBLEM TO BE SOLVED: To provide a material search device and the like which search for books/materials that match a user's interest on the basis of a document image with comments.SOLUTION: A material search device 1 stores a feature word database 15 related to appearance frequency of a feature word included in a material to be searched in advance. A document input part 11 takes in an input document 33 image including comments the user brings in. A character recognition/comment extraction part 12 converts printed characters of the input document 33 and a handwritten character 39 into text data and extracts the kind and position of a comment mark 37. A feature word extraction part 13 extracts a feature word included in the text data. A feature word weighting part 14 applies weight, counts the appearance frequency of a feature word in accordance with the kind of comment mark 37, and creates feature data 47. A relevance computation part 16 computes relevance between a search index 31 and the feature data 47, whereas a search result display part 17 presents to a user a highly relevant material to search.