A first control apparatus of multiple control apparatuses in a system, including a memory unit and a processor. The memory unit stores multiple management information managed by respective control apparatuses and multiple modification information indicating update statuses of respective management information. In response to receiving first modification information corresponding to first management information managed by the first control apparatus from a second control apparatus, the processor compares the received first modification information, with first modification information stored in the memory unit. When the received first modification information does not match the first modification information stored in the memory unit, the processor notifies the second control apparatus of a response including information about the first management information and the first modification information stored in the memory unit, to cause the first management information and the first modification information stored in the second control apparatus, to be updated.