PURPOSE:To prevent the change of relation between objects from causing the change of object structure of the increase or decrease of a slot by expressing the relation between some object and another object by a relational object prepared separately from some object and another object. CONSTITUTION:For instance, when the relation of friendship is set between the object A and the object B, the relational object for expressing the relation between the object A and the object B, that is, the friendship relation is newly generated. Then, the relation between the object A and the object B is described by this relational object friendship relation. Thus, if the relation between the respective objects is expressed by the relational object, it is enough for each object to have only one slot for expressing the relation. Thus, the structure of each object can be kept uniform.
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