To provide a server and a client server system continuously performing jobs even when jobs of a client are completed, and restoring the data related to the jobs and providing the data to the client.

The server for controlling a device to be controlled based on a request from the client comprises a database, a control status saving part for saving control information on the request from the client in the database, a job continuing part for continuously controlling the device to be controlled based on the control information on the request saved in the database, a job data saving part for saving the response data from the device to be controlled to the control by the job continuing part in the database corresponding to the control information, and a data restoring part for preparing restoration message to the client base on the control information on the requests saved in the database and the response data corresponding to the control information.