This system includes: plural first information processing apparatuses on which a virtual machine that belongs to either of plural subnets; plural second information processing apparatuses on which a virtual router used for communication between subnets; a controller that controls communication paths within a subnet, deployment of the virtual machine and deployment of the virtual router; and plural switches that connects the plural first information processing apparatuses, the plural second information processing apparatuses and the controller. The controller selects any one of the virtual machine, the virtual router and a communication path within any one of the plural subnets based on a predetermined evaluation value concerning a communication amount for each first information processing apparatus and a predetermined evaluation value concerning a communication amount for each switch, and changes deployment destination of the selected virtual machine or the selected virtual router or the selected communication path.