The purpose of this research is to review how Korean KM companies are applying information technology to their operations from the four perspectives of knowledge conversion (KC) and to suggest ideas for introducing appropriate knowledge management implementation methodology through the case studies of Korean KM companies that have adopted knowledge management strategy using information technology. This research was conducted focusing on the cases of companies that are carrying out knowledge management by applying information technology and the result shows that Korean KM companies place high value on the application of information technology in introducing knowledge management. However, the use of information technology is not common to all kind of companies in four kinds of knowledge conversion.