9. The apparatus of claim 7 , wherein the object searching part constructs, among object properties included within the object search range, a monadic relation table for object properties which do not form relations with other objects and a dyadic relation table for object properties which form relations with other object.
9. The apparatus of claim 7 , wherein the object searching part constructs, among object properties included within the object search range, a monadic relation table for object properties which do not form relations with other objects and a dyadic relation table for object properties which form relations with other object. 10. The apparatus of claim 9 , wherein the object searching part searches the object corresponding to the intermediate referential expression based on at least one of the constructed monadic table and the constructed dyadic relation table.