Method and system transmitting resource allocation information in a communication system

A method and a system for transmitting resource allocation information in a communication system are provided to acquire resource allocation information only for a relay station to relay signals between a base station and a mobile station through a FCH(Frame Control Header), thereby reducing the size of a resource allocation information message, reducing a calculation amount, and minimizing delay. A method for transmitting resource allocation information comprises the following steps of: receiving resource allocation information from a base station(100); recognizing first resource allocation information from the received resource allocation information; and recognizing second resource allocation information only for a relay station from the first resource allocation information.