PURPOSE: A wireless network system based on a cooperative relay device, a cooperative relay method, and a cooperative relay method are provided to largely improve the information transmission efficiency on a cooperative communication. CONSTITUTION: A relay declaration unit(240) grasp i th maximum obtain relay device among the plurality of relay devices based on a wireless channel obtain of the relay device and a wireless channel obtain which is signaled from the other relay devices among a plurality of relay devices. If the i th maximum obtain relay device is a current relay device, the relay declaration unit signals a message expressing the i the RF signal to each plurality of relay devices. If the i th maximum obtain relay device is a current device, a signal transmission unit(250) transmits an i th RF signal which satisfied decoding by a decoding unit during a i+1 th time slot interval which reverses the i th tiem slot interval.
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