When information expressed by concept is input to a natural language processing system, the form of expressing the input concept is selected by referring to a knowledge base having the knowledge of languages, general knowledge, and the knowledge of specific areas. In addition, the information expressed...http://www.google.com.hk/patents/US6023669?utm_source=gb-gplus-share專利 US6023669 - System for generating natural language information from information expressed by concept and method therefor