Network system and power saving managing device and service device

摘要: PROBLEM TO BE SOLVED: To improve the power saving efficiency of a service device on network such as printer. SOLUTION: A printer 20 is provided with start controlling part for monitoring only prescribed request communication, and instructing source supply to other parts at time receiving communication. An LAN 40 managing 10 state each 20. When print does not come beyond time, broadcasts transition notice including address its own device, stops than part. At detecting notice, stores finding any in state, transmits so that can be turned into printable state. Thus, effect increased by stopping COPYRIGHT: (C)2001,JPO