The present invention discloses a method in which a terminal transmits an acknowledgement/negative acknowledgement (ACK/NACK) signal in a wireless communication system. In detail, the comprises the steps of allocating a first control channel resource to the ACK/NACK signal and a second control channel resource to a channel quality information (CQI) signal, determining the transmission power of the first control channel resource and the transmission power of the second control channel resource in accordance with a preset priority, and transmitting the ACK/NACK signal and the CQI signal to a base station using the control channel resources and the transmission powers corresponding thereto.