2. The video decoding method of claim 1 , wherein the first available candidate block correspond to a combination of two merge candidates of the neighboring blocks and selected based on a predetermined combination priority of the neighboring blocks.
2. The video decoding method of claim 1 , wherein the first available candidate block correspond to a combination of two merge candidates of the neighboring blocks and selected based on a predetermined combination priority of the neighboring blocks. 4. The video decoding method of claim 2 , wherein the adding into the merge candidate set stops adding the combined bi-predictive motion parameter without considering the number of added combined bi-predictive motion parameters when a predetermined adding end conditions are satisfied.