A server system has a shared storage device including a job queue storage area, a job queue registration request storage area and a job assignment storage area, a first server including a job queue registration processing unit registering the job execution request in the job queue storage area according to the registration request information written to the job queue registration request storage area, a second server including an assignment processing unit assigning the job execution request registered in the job queue storage area to the execution server, and writing the relationship between the execution server and the job execution request of the job assigned to the execution server to the job assignment storage area, and an execution server including an execution unit acquiring the job execution request from the job assignment storage area provided for the execution server, and executing the assigned job.