1. A moving picture processor comprising: a first detector configured to detect a reference block most similar to a target block for which motion is to be detected and which is set in a current picture, and to generate a first motion vector candidate indicating a relative position between the target block and the reference block, the reference block is set in a reference picture different from the current picture in terms of time; a second detector configured to detect a first reference area most similar to a first target area obtained by combining the target block and a first adjacent block adjacent to the target block, and to generate a second motion vector candidate indicating a relative position between the first target area and the first reference area, the first reference area is set in the reference picture; and a determination circuit configured to determine a motion vector for the target block, based on the first and second motion vector candidates.