The invention provides a data receiving method and a data receiving device for receiving data. The method comprises following steps: (a) receiving data in a first-time transmission and in a retransmission; (b) demodulating the received data in the first-time transmission and in the retransmission; (c) exchanging the bit position of the demodulated data in signs in the retransmission; and (d) merging the data (I) which is received and demodulated in the first-time transmission and the data (II) which is generated and whose bit position is exchanged in the step (c).