1. A method for configuring a channel in an Orthogonal Frequency Division Multiple Access (OFDMA) wireless communication system, comprising: configuring as many diversity channel first sets as the number of diversity channels available for a frame in a third set, selecting as many Adaptive Modulation and Coding (AMC) channels as the number of diversity channels from among AMC channels available for the frame, and configuring an AMC channel second set in the third set by mapping the selected AMC channels to unselected AMC channels; and configuring upper sets using the third set including the diversity channel first set and the AMC channel second set, wherein indexes of the selected AMC channels are determined by dividing the number of the AMC channels available for the frame by the number of the selected AMC channels, multiplying a result from the division respectively by 0 and integers less than the number of the selected AMC channels, and selecting minimum integers greater than or equal to integers from the results of the multiplication. and binding the selected AMC channels to AMC channels adjacent to the selected AMC channels.