A virtual system, which realizes virtual computing environments for performing communication processing, includes a user virtual machine which is provided as a virtual machine environment to be used by users, and a service virtual machine which has a physical communication interface with a real network for communication between the real network and the user virtual machine, provides a virtual communication interface with the user virtual machine by Ethernet (registered trademark), and performs an interface conversion process for the communication between the real network and the user virtual machine if the physical communication interface is not by using Ethernet (registered trademark), in which the physical communication interface is converted to an equivalent interface using Ethernet (registered trademark).