Most of the Affiliated Organizations of the Local Governments are constantly exposed to cyber threats due to the lack of dedicated information security organizations, dedicated personnel and interest from institutions. As an institution invested and contributed by the Local Government, it has the legal responsibility of management and supervision. Therefore, in this study, the network of the Local Government is connected by using the network of the Local Government, information security infrastructure, and security control infrastructure. It was an opportunity to conduct research on the improvement of the security control system of the Local Government to protect important information (personal information, etc.) owned by the Local Government. In the long term, we propose a transfer to the cloud system for stable services of personal information processing systems such as public systems, ERPs, and groupwares operated by Affiliated Organizations, and consider enhancing the security of Affiliated Organizations and security control. It is hoped that the results of this study will be helpful to the Local Governments.