Abstract: A controller of a tag conversion apparatus configured holds tag conversion information associating addresses of communication apparatuses and information on tags of tagging schemes for network separation, analyzes a frame input from one of the plurality of ports and determine a current tagging scheme of the frame, determines a tagging scheme associated with a destination address of the frame based on the tag conversion information, and converts the frame to a frame of the tagging scheme associated with the destination address based on the tag conversion information when the tagging scheme associated with the destination address and the current tagging scheme are different.

Abstract: A controller of a tag conversion apparatus configured holds tag conversion information associating addresses of communication apparatuses and information on tags of tagging schemes for network separation, analyzes a frame input from one of the plurality of ports and determine a current tagging scheme of the frame, determines a tagging scheme associated with a destination address of the frame based on the tag conversion information, and converts the frame to a frame of the tagging scheme associated with the destination address based on the tag conversion information when the tagging scheme associated with the destination address and the current tagging scheme are different.

Abstract: There is provided a method of constructing a logical network which determines a network apparatus of a deployment location and a middlebox apparatus when the logical network is constructed on a physical network to which the network apparatus, the middlebox apparatus, and a physical server are coupled, in which an abstract configuration of the logical network and logical network information including a performance requirement with respect to a configuration element are received, and the network apparatus which become a deployment location of the logical network and the middlebox apparatus are determined according to the abstract configuration of the logical network and the performance requirement.

Abstract: In an MB management system, a user who wishes to use a network service sends MB requirements from a user terminal to a network management apparatus, which is managed by a provider who provides a network service. The network management apparatus returns to the user terminal abstract models as a guide for the performance and the like of MBs that are available in the network service and that meet the MB requirements. The user operates the user terminal to select an MB that the user is to use from among the provided abstract models. The user also receives via the user terminal from the network management apparatus the operational status of an instance of the MB selected from among the abstract models. This allows the user to compare the MB requirements presented by the user and the actual operational status of the MB instance.