An image display apparatus for displaying a composite image of an ordinary image and a special image which allows instantaneous recognition of the position of a portion appearing in the fluorescence image in the ordinary image without impairing visible information of the ordinary image. The apparatus includes a light emission unit for emitting ordinary light and special light directed to an observation area and an imaging unit having an ordinary image sensor for capturing an ordinary image by photoelectrically converting reflection light reflected from the observation area irradiated with the ordinary light and a special image sensor for capturing a special image by photoelectrically converting light emitted from the observation area irradiated with the special light and is controlled such that a charge storage amount stored in the special image sensor for each frame is periodically changed.
