According to one embodiment, an image display device that displays acquired image frames includes: an image processing unit that detects a location of a target in a first image frame among the image frames and generates a first predicted location of the target in a second image frame acquired at a first time when a predetermined number of frames or predetermined period of time has passed since the first image frame is acquired; a script processing unit that generates at least one tracking image that starts from the location of the target in the first image frame and heads toward the first predicted location in the second image frame; a synthesis unit that generates combined images where the at least one tracking image is put on image frames between the first and second image frame; and a display unit that displays the combined images.