11. The device according to claim 10 , wherein the first selecting module is further configured such that: the restricted sub-set bitmap comprises L information bits; when sub-set restriction is performed on the code words in the first codebook and the second codebook jointly, L=2 M+N ; when sub-set restriction is only performed on the code words in the first codebook, L=2 M ; when sub-set restriction is only performed on the code words in the second codebook, L=2 N ; and when sub-set restriction is performed on the code words in the first codebook and the second codebook separately, L=2 M 2 N ; wherein M refers to the number of the code words in the first codebook, and N refers to the number of the code words in the second codebook.
11. The device according to claim 10 , wherein the first selecting module is further configured such that: the restricted sub-set bitmap comprises L information bits; when sub-set restriction is performed on the code words in the first codebook and the second codebook jointly, L=2 M+N ; when sub-set restriction is only performed on the code words in the first codebook, L=2 M ; when sub-set restriction is only performed on the code words in the second codebook, L=2 N ; and when sub-set restriction is performed on the code words in the first codebook and the second codebook separately, L=2 M 2 N ; wherein M refers to the number of the code words in the first codebook, and N refers to the number of the code words in the second codebook. 12. A system for configuring codebooks comprising a transmitting end comprising the device according to claim 11 and a receiving end comprising a second selecting module and a second transmitting and receiving module, wherein the second transmitting and receiving module is configured to obtain a code word restricted sub-set selected by the transmitting end and inform the second selecting module of the selected code word restricted sub-set, and inform the transmitting end of an index of an optimal pre-coded code word selected by the second selecting module; and the second selecting module is configured to select the optimal pre-coded code word from the code word restricted sub-set, and inform the second transmitting and receiving module of the index of the optimal pre-coded code word.