1. A method of processing and controlling a virtual server that is performed by a management server for a hypervisor that can operate a virtual server, wherein the hypervisor operates on one physical server, the virtual server operates in accordance with a file image on one data store, and the management server, when being instructed to execute a task that is configured by a series of steps for a predetermined execution place, gives an instruction for changing the execution place of the steps to a temporary execution place and executing the task and, after the execution at the temporary execution place, causes the virtual server to transit from the temporary execution place to the predetermined execution place, and gives an instruction for continuously executing the task at the predetermined execution place.