Transmission control method in a network system for interactively transmitting a signal between node devices and network system using the same

A transmission control method to be performed in a network system, which has a plurality of node devices and in which a signal is interactively transmitted between the node devices, said transmission control method comprising:

• a storing step of temporarily storing a signal to be output, in a first node device which is one of the plurality of the node devices;
• and
• an outputting step of outputting the temporarily-stored signal in the first node device selectively to a second node device, which is adjacent to the first node device, through a first channel, or to a second channel which is used when the second node device outputs a signal to the first node device, the first node device being controlled in said outputting step such that when the second node device is not transmitting a signal to the second channel, the first node device can output the signal to the second channel to which no signal is output.