A medical image display apparatus which displays, in a display screen, a display image having undergone gray level transform of changing number of gray levels of a medical image, obtains a representative value of pixel values concerning a region of a block, in the medical image, which corresponds to each partial region in a region designated in the display image. The medical image display apparatus sets a specific region in the display screen so as to include the designated region, and superimposes/displays and arranges obtained representative values on the specific region in correspondence with the arrangement of the partial regions.