Patent ID: 7469240

Claim:
A computer-readable recording medium that stores a computer program for classifying documents including words in a second domain according to categories for classifying documents including words in a first domain, wherein the computer program causes a computer to execute the process comprising: extracting first feature vectors from the words in the documents in the first domain and extracting second feature vectors from the words in the documents in the second domain; generating a vector transforming rule that transforms, when a word correspondence between the words in the first documents and the words in the second documents is given, the first feature vectors into the second feature vectors based on the word correspondence; generating a classification rule that classifies the second document by the categories, by transforming a first representative vector in the category into a second representative vector in the second domain that represents a corresponding category to that in the first domain, and by corresponding the first representative feature vector and the second representative feature vector; and classifying the documents in the second domain into the categories based on the classification rule.