Abstract: In a computer system, a device which takes the real area as the objects (1-1, . . . ) and selects dynamically the real data (11) as the actors (2-1, . . . ) and the method (42) for processing such actors, is provided, objects (1-1 . . . ) are formed by capsulating the instance including real data (11) as the parts and the method (42) and thereby data processing is carried out mainly with the actors (2-2 . . . ), namely the real data. In view of dynamically forming an object (1-2) capsulating the real data (instance) (11) and the method (42), a part called the object sensor which indicates the real data (11) given the meaning by the command is prepared, the command is sent and received in the data processing means by the object modeling the real area, and thereby new type and practical object-oriented data processing just suitable for processing of multi-media data, distributed processing of data base and processing of network system can be realized.