Patent ID: 7634473

Claim:
A document retrieval apparatus for retrieving a retrieved document from a document database in which documents are registered, and displaying the retrieved document, the document retrieval apparatus comprising: a document retrieval unit for retrieving the retrieved document from the document database based on a retrieval keyword; a keyword weight calculation unit for calculating a keyword weight of the retrieval keyword, which represents at least a degree of relevance between the retrieval keyword and contents of the retrieved document, the keyword weight calculation unit calculating the keyword weight of the retrieval keyword in part by multiplying both: a number of occurrences of the retrieval keyword in the retrieved document, and a preset weight of the retrieval keyword, which is set before the document retrieval unit retrieves the retrieved document, and which represents a relative importance of the retrieval keyword with respect to other retrieval keywords in a same search query; and a display process unit for displaying the retrieved document in a state where the retrieval keyword contained in the retrieved document is presented in a display aspect reflecting the keyword weight by changing a density of highlighting, changing a sort of meshing and changing a gradation of a background.