Disclosed is a communication network system in a bus network structure, the system including: a broker processing a message routing; a connector; and a plurality of services connected to the broker via the connector, wherein: the service is a communicable terminal node and each of the plurality of services is connected to the broker via one connector, the connector is a module for mediating a connection between the service and the broker, each connector connected to only one broker, and the broker is a module for setting up a routing path or the connection with the connector, and to process the message routing, all brokers connected to each other in a full mesh topology.