Patent ID: 8223651

Claim:
An information processing apparatus that retains topology information indicating how all nodes are coupled, in a predetermined target area within a network that is divided into a plurality of areas, the information processing apparatus comprising: a storage; and a processor configured to determine, by referring to the storage having stored therein connected area information indicative of which area the node at a border with another area is coupled to, an ingress-node group of ingress nodes each serving as an entrance to the target area from an adjacent area and an egress-node group of egress nodes each serving as an exit from the target area to another adjacent area; to determine, by referring to the topology information, whether two or more disjoint routes from one or more node of the ingress-node group to reach one or more node of the egress-node group are present; only when it is determined that two or more disjoint routes are present, to abstract the ingress-node group into one node as an ingress abstract node, to abstract the egress-node group into one node as an egress abstract node, and to perform a process of generating summarized information indicating a route from the adjacent area through the target area to the other adjacent area as a link between the ingress abstract node and the egress abstract node; and to report the summarized information to another area.