A communication control method which performs route control in a communication system comprising: a specific network constituting an Internet; a first network configured to accommodate a specific device connected to the specific network and to be managed by a user who uses the Internet; a second network provided between the specific network and the first network; and a filter device configured to restrict a communication leading to a predetermined address space via a first path when a predetermined constraint condition is satisfied and to allow a communication leading to the predetermined address space via the first path when the constraint condition is not satisfied, the communication control method comprising: causing a communication control device in the communication system to execute a communication route-setting process of, in accordance with routing information defining a path leading from the specific network side to the first network to be branched in the second network, controlling the path such that the first path of the branched path is set as a path leading to predetermined address space including an address of the specific device via the filter device, and the communication control method being characterized by comprising: causing a communication control device in the communication system to execute a communication route-setting process of, in accordance with the routing information, controlling the path such that 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 without passing through the filter device. a specific network constituting an Internet; a first network configured to accommodate a specific device connected to the specific network and to be managed by a user who uses the Internet; a second network provided between the specific network and the first network; and a filter device configured to restrict a communication leading to a predetermined address space via a first path when a predetermined constraint condition is satisfied and to allow a communication leading to the predetermined address space via the first path when the constraint condition is not satisfied, the communication control method comprising: causing a communication control device in the communication system to execute a communication route-setting process of, in accordance with routing information defining a path leading from the specific network side to the first network to be branched in the second network, controlling the path such that the first path of the branched path is set as a path leading to predetermined address space including an address of the specific device via the filter device, and the communication control method being characterized by comprising: causing a communication control device in the communication system to execute a communication route-setting process of, in accordance with the routing information, controlling the path such that 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 without passing through the filter device. <EOS>