Provided are an image display apparatus and image display method whereby a natural composite image can easily be acquired. An image display apparatus 1 is provided with an objective optical system 5, an optical path splitting element 6, an imaging element 7, an image processing device 3, and a display device 4, a first image formation region 11 and a second image formation region 12 both being images of the visual field of the objective optical system 5, an outer edge 13 of a first image formation region and an outer edge 14 of a second image formation region being positioned inside a predetermined imaging region 15, an outer edge positioned in the predetermined imaging region 15 being imaged by the imaging element 7, and the image processing device 3 having reference data, and in the image processing device 3, a feature point of the first image formation region being calculated on the basis of the outer edge 13 of the first image formation region, a feature point of the second image formation region being calculated on the basis of the outer edge 14 of the second image formation region, the amount of offset between the predetermined image formation region 15 and the imaging element 7 being calculated from the feature point of the first image formation region, the feature point of the second formation region, and the reference data, and the display position of a first image and the display position of a second image being determined from the amount of offset.L'invention concerne un appareil d'affichage d'image et un procédé d'affichage d'image permettant d'acquérir facilement une image composite naturelle. Un appareil d'affichage d'image 1 comprend un système optique d'objectif 5, un élément de division de trajet optique 6, un élément d'imagerie 7, un dispositif de traitement d'image 3, et un dispositif d'affichage 4, une première région de formation d'image 11 et une seconde région de formation d'image 12, toutes deux des images du champ visuel du système optique d
