A moving-image processing device (101) synthesizes a first moving image and a second moving image. In the first moving image, a first object is drawn, and accompanied by first-object depth information. In the second moving image, a second object is drawn, and accompanied by second-object depth information. A moving image generator (105) generates a third moving image in which the first moving image and the second moving image are synthesized. A clash determiner (103) serving as an interference determiner refers to the first-object depth information and the second-object depth information to determine whether the first object and the second object in the third moving image satisfy interference conditions. If it is determined that the interference conditions are satisfied, a corrector (106) corrects the second moving image by performing a non-deforming transformation in which the shape of the trajectory expressing movement in three-dimensional space over time is maintained.