A communication controller performs route control in a communication system comprising a specific network, a first network configured to accommodate a specific device connected to the specific network, a second network provided between the specific network and the first network, and a filter configured to restrict communication according to a predetermined condition. The communication controller device includes: a route-setting device which controls the path such that a first path of the branched path is set as a path leading to a predetermined address space including an address of the specific device via the filter, and a second path of the branched path is set as a path leading to the first network in which the predetermined address space is excluded from an address space of the first network.