Management system and method, and data processing apparatus

摘要

A center apparatus manages a to-be-managed apparatus, wherein: the center apparatus performs a management operation on the to-be-managed apparatus by making a call to the to-be-managed apparatus so as to establish a communications circuit therewith according to predetermined parameters; and the to-be-managed apparatus makes a parameter change occurrence inquiry to the center apparatus at predetermined intervals for inquiring the center apparatus whether or not a parameter change occurs.