Disclosed in the present application is a method by which a terminal transmits and receives a signal. Particularly, the method comprises the steps of: receiving a downlink signal from a plurality of cells; transmitting, to a serving cell among the plurality of cells, an acknowledgement/negative ACK (ACK/NACK) response for the downlink signal; and receiving, from at least one cell among the plurality of cells, retransmission for the downlink signal.