This research is devoted to applying Soft System Methodology(SSM) for the in-formation policy decision making. In many cases, the information policy of the Medium-Small sized Enterprise is very important to knowledge based information management environment. However, the selecting of information policy alternatives is difficult in that the decision making process should include the real situation of the shop floor and the skill and knowledge of the information system operators. Furthermore, the elements of information policy are more qualitative than quantitative. In this case study, Soft System Methodology(SSM) has been applied for the decision making process of the information policy in order to choose the optimal alternative. According to the result, the information system chosen by SSM is proven to solve the complicated problems and has also concerned management environment of the case company.