PURPOSE: To execute management of reference to a low-level language object from a first program.

CONSTITUTION: An object generation means so, an object storage memory 60, and a means which relates a slot assigned to the first program 10 to an object are included in a second program 20. An interface 30 is generated between first and second programs 10 and 20, and object agencies including identifiers of prescribed objects are included in the interface 30. An agency reference to discriminate an object agency is stored in a slot by the first program 10 for the purpose of relating the slot to the object agency. During the operation of the first program 10, old agency references are erased and are substituted with another agency references to redefine the slots. If an object agency is not related to any slots by any agency references, a high-level language unnecessary information collector 90 reports it to the second program 20.