Abstract: An image data processing apparatus by which a general flow of images can be grasped readily and an editing operation can be performed at a high efficiency includes a sample data producing unit for one-dimensionally sampling animation image data successively received from an animation image generating source in one direction while successively moving the sampling position in the other direction to produce data of a still image, a display screen for displaying thereon a group of such still images of the still image data received from the sample data producing unit, point designating and area designating units for designating a predetermined point and a predetermined area of the still images displayed on the display, and a time code converting unit for producing time codes corresponding to the point and the area designated by the point and area designating units, respectively.