The present invention relates to a power control method in a two-way relay network, and provides a power control method in a two-way relay network in which a minimum transmission rating and a synthesized transmission rating of the overall system are magnified if there are restrictions on the synthesized power of terminals and a repeater in the two-way relay network in which two terminals transmit and receive data through the repeater. To this end, the power control method in the two-way relay network of the present invention comprises the steps of: determining the ratio of power allocated to the respective terminals and the repeater according to each subcarrier, under the restrictions on the synthesized power of each terminal and the repeater; and determining power allocated to each subcarrier according to the determined power allocation ratio.
