1. An image fusion system comprising: an image selection unit configured to select at least two images from a plurality of images captured by a plurality of different type cameras; a first matching unit configured to match the selected images by adjusting, based on zoom information about the selected images, aspect ratios of the selected images to be the same as a reference aspect ratio, wherein the aspect ratios are determined according to field of views (FOVs) to capture the selected images, respectively; a second matching unit configured to match the selected images by adjusting resolutions of the selected images to be the same as a reference resolution; a third matching unit configured to match the selected images by applying a mutual geometric relationship between the selected images; and a fusion unit configured to fuse the selected images which are matched by the first to third matching units, and thus generate a fused image.