To achieve coordinated operations of a plurality of network household electric appliances under the assumption of such flow processing that only after a first processing is performed to an object by a first network household electric appliance, a second processing is performed by a second network household electric appliance.
The first network household electric appliance 20 performs a first processing to an object 1a attached with a radio IC tag 2a, and writes information(end information) showing that processing by the first network household electric appliance 20 has ended after the end of the first processing in the storage region of the radio IC tag 2a by a reading/writing means 3a. The second network household electric appliance 30 reads the storage region of the radio IC tag 2b by a reading/writing means 3b in performing the second processing, and confirms whether or not the end information has been written.
YOSHIMURA YASUO
Hiroki Naito
Daisuke Nagano