A security server monitoring device is provided that performs quick redistribution of loads when a server load increases due to virus infections. A security server performs a virus check on data flowing through a network, thus statistical data relating to detected viruses can be obtained. For example, future communication traffic and increases and decreases in server loads are predicted using statistical information such as the number of virus infections (number of virus infections per unit of time), and on the basis of this prediction, a security server allocated to a path is quickly changed from a security server in which a high load is predicted to a security server with a comparably low load.