A BAS/load balancer which combines the functions of a BAS (Broadband Access Server) providing a dynamic network connection to a user network, and a load balancing relaying the communications traffic of the user network to one of plural load balancing target apparatuses, and which can apply an arbitrary load balancing algorithm. When the BAS/load balancer of the invention sets up a dynamic connection between the user networks, the balancer determines the load balancing target apparatus which is a relay destination using an arbitrary load balancing algorithm for both send and receive communications traffic in the user network.