1. A medical image display apparatus, comprising: processing circuitry configured to cause a first display region on a display to display a plurality of modified medical images that are generated by reducing a length, in a predetermined direction of the first display region, of a plurality of medical images of substantially an identical region of a subject, wherein partial areas of the modified medical images overlap with each other in such a manner as to arrange the modified medical images in the predetermined direction; detect a selection operation to select at least two of the displayed modified medical images to be fused, from the plurality of modified medical images; and generate a fused image from the at least two medical images corresponding to the at least two selected modified medical images selected by the selection operation, wherein the processing circuitry is further configured to cause the fused image to be displayed in a second display region on the display, which is different from the first display region on the display.