The use of cloud services among SMEs remains low, and R&D and technical support for SMEs is an urgent problem. Even so, there have been almost no academic studies on the relationship between cloud computing and SME information infrastructure, or on the future direction of this. With this background, we considered and designed a cloud system framework suitable for SMEs, built a prototype model and investigated the ease of implementation. Services that deliver functionality equivalent to Amazon EC2 which is representative cloud service but delivered through other technologies are called EC2 clones. OpenStack is not EC2 clone, and is a typical open source project for providing Infrastructure as a Service (IaaS) type cloud services. OpenStack was used in this study to implement a simple cloud service model.