In recent years, some novel retrieval systems which use kansei keywords have been developed. We have developed the retrieval system that 11432 children's books can be searched for by the kansei keywords picked up from online book reviews. The system was evaluated by school librarians who found that the system was useful for the education of children. In order to improve the system to the level of practical use, to add kansei keywords is necessary, few experts, however, can deal with kansei keywords. The purpose of this rsearch is to examine the methods of adding kansei keywords automatically based on the keywords which experts added. In case the words are in common with the words in the book review the experts added the kansei keywords, the same kansei keywords are added the book.