A method for transmitting ACK/NACK (Acknowledgement/Negative ACK) signals in a wireless communication system is disclosed. The method comprises receiving a plurality of data blocks from a base station; generating ACK/NACK signals corresponding to the plurality of data blocks; allocating resources for transmitting ACK/NACK signals, wherein the resources are allocated independently per slot; and transmitting the ACK/NACK signals through one uplink component carrier by using the allocated resources. Preferably, the step of allocating resources includes allocating the resources to minimize the difference in the number of the ACK/NACK signals transmitted per slot.