| 摘要 |
A network system includes devices connected to a network each of which is assigned an ordinal rank in the system, in which a device of the highest ordinal rank functions as a master device and devices of the other ordinal ranks function as general devices. In the network system, each device includes: a master device checking unit configured to operate when the device is functioning as a general device to check that a device functioning as the master device exists in the system; an ordinal rank judging unit configured to judge the ordinal rank of the device when no device functioning as the master device exists; and a first control unit configured to control the device to function as the master device when the ordinal rank of the device is judged to be the highest by the ordinal rank judging unit.
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