1. A non-transitory computer-readable storage medium containing a first set of instructions, which executed by a processor, allow the processor to: (1) extract extracted instances information of a plurality of virtual resources and extracted logical connection information among a plurality of the instances of the virtual resources from device setting information with referring to a plurality of creation patterns and a plurality of connection patterns, wherein the connection patterns include a connection string pattern of setting information of a type of device regarding logical connection among each of instances of a plurality of the virtual resources, wherein the creation patterns include a creation string pattern of setting information of the type of device regarding definition of instances of virtual resources of plural types of virtualization technologies including virtual LAN technologies, wherein the virtual LAN technologies includes a virtual interface and a virtual router, and (2) generate a logical topology information of a virtual network according to both the extracted instance information of the virtual resources and the extracted logical connection information among the resources of the virtual resources, wherein the virtual network includes a plurality of virtual network devices and is configured on an information processing system in which a plurality of physical devices including network devices are connected with a physical network and, wherein the virtual network is configured with the physical devices in such a manner that instances of a plurality of types of virtual resources generated by plural types of virtualization technologies are connected with each other by logical connections.