We propose an object oriented reference model with several middleware tools, which includes OODB, GUI libraries, and CORBA. It is approved that a software structure with a framework brings various advantages. However unplanned combinations of the different frameworks often cause the problem, which greatly decrease their expected effectiveness. We therefore propose MVIm (Model-View-Interface manager) model to escape from this problem. Since the interface manager indirectly combines between middleware, we can effectively use the middleware without bad interference.