In the case of the systems of other companies, the existing system should be removed and a new system should be built when a problem occurs with the existing system over time because the new system is not at all compatible with the old system if the system has been upgraded. In the meantime, the system of Shina maintains system consistency and provides customers with a differentiated value as the basic architecture of the product is developed considering the future system upgrade and the new systems and the existing systems can be used together by only modifying the firmware.