1. A moving picture decoding method for decoding a current block, comprising: determining a first candidate and a second candidate, the first candidate having a first motion vector that has been used to decode a first block, and the second candidate having a second motion vector that has been used to decode a second block that is different from the first block; generating a new candidate having a third motion vector and a fourth motion vector, the third motion vector being identical to the first motion vector, and the fourth motion vector being identical to the second motion vector; and decoding the current block by using a candidate from among a plurality of candidates including the first candidate, the second candidate, and the new candidate.