Patent ID: 7042894

Claim:
A controlling apparatus for exchanging an information signal among a plurality of electronic devices through a network system, comprising: a control information obtaining part for obtaining control information from the plurality of electronic devices, the control information allowing the plurality of electronic devices to be controlled; a time setting function determining part for determining whether the plurality of electronic devices have a time setting function corresponding to the control information obtained by the control information obtaining part; a time information obtaining part for obtaining time information; and a time information setting part for setting each of the electronic devices determined as devices having the time setting function by the time setting function determining part to the time information obtained by the time information obtaining part wherein the time information obtaining part includes a clock accuracy determining part configured to determine an accuracy value of one or more clocks present in the network system, wherein the time information obtaining part obtains the time information from a highest time accuracy clock, wherein the highest time accuracy clock has the best accuracy value of the accuracy values determined by the clock accuracy determining part.