To provide an easy and simple mapping between objects representing different network systems A and B. In the configuration where data of an object, a system component, is available in another system, it is provided with an intermediate model 102 which is mutually accessible. The intermediate model has an intermediate object 103corresponding to a component. Each system performs mapping to the intermediate object 103 an item of a corresponding component 106 of the system, and transmits data to an mapped item. In addition, the system accesses the intermediate object to obtain data corresponding to the item when component data of the other system is needed.