1. A channel assignment method for a wireless network comprising: a) receiving or collecting node information including available channel information of individual nodes in a wireless network; b) calculating a multi-connection relationship of connection links among the individual nodes using the collected node information; c) calculating a channel conflict relationship caused by interference of the connection links among the individual nodes according to the calculated multi-connection relationship; d) assigning a channel to the connection links among the individual nodes by referring to the calculated channel conflict relationship; and e) transmitting the channel assigned to each link to the individual nodes.