Internet services continue to expand and become increasingly indispensable in our daily lives. For a server system to realize power savings and high availability, which involves reducing the frequency of a condition in which offers of service cannot be made, is important. The present study proposes a hybrid operation method and examines a method for constructing a power-saving high-availability server system (PSHASS) incorporating the hybrid operation method. In addition, the present study exhibits the characteristics of both a power-saving server system and a high-availability server system. These systems can operate independently. An experimental server system using the proposed method was constructed. Experiments to reproduce several types of trouble in the server system in moderate or power-saving operation state were conducted. The proposed PSHASS was found to be able to automatically recover to a normal condition from a condition in which trouble occurs. Since both the power savings and high availability of the server system can be effectively realized by incorporating the proposed method, expansion of Internet services can be expected, providing greater convenience in our daily lives.