The present invention relates to a method for configuring and transmitting an HARQ ACK/NACK signal by bundling said signal about a component carrier wave of a downlink subframe linked with an uplink subframe transmitting an HARQ ACK/NACK signal on PUCCH format 3. More particularly, the method comprises the steps of: determining a mode for bundling an HARQ ACK/NACK signal; and configuring the bundled HARQ ACK/NACK signal according to the determined bundling mode, wherein in the step of determining the bundling mode, all the component carriers of the downlink subframe transmitting the HARQ ACK/NACK signal to an uplink subframe are bundled when the downlink channel is in a worse state than the predetermined reference state, and some of the component carriers of the downlink subframe transmitting the HARQ ACK/NACK signal to an uplink subframe are bundled when the downlink channel is not in a worse state.