A data combining apparatus and a data combining method in which timing for transformation, movement (arrangement), and generation of data combined in accordance with timing information can be corrected and a screen formation to be needed for matching of timing can be formed by combination, wherein a data combining apparatus 100 generates timing information of a change of the screen formation by a timing information generation unit 108 and synchronizes generation timing in the graphics generation unit 103 to process timing for image data in a transformation and movement processing unit 105 to enable combination of the image data and the graphics without timing deviation to thereby obtain desired combined data in a combining unit 107.