1. An ophthalmologic image processing apparatus that masks a fundus image using an aperture mask image, comprising: input means for inputting the fundus image; image generation means for generating an aperture mask image in accordance with information of the fundus image or inputting the aperture mask image; image adjustment means for adjusting a value of the fundus image; and synthesizing means for synthesizing the fundus image whose value is adjusted with the aperture mask image, wherein the image adjustment means adjusts the value of the fundus image based on coordinates in a boundary between a mask area of the aperture mask image and an area of the fundus image.