An illumination apparatus illuminates probe light. A gating camera captures an image for each of image capture ranges divided in the depth direction. A camera controller controls a timing at which the illumination apparatus illuminates the probe light and a timing at which an image sensor is exposed such that each slice image output from the image sensor for each image capture range includes only an object included in the corresponding image capture range while changing the image capture range. An image processing unit generates a final image including the entire object of interest based on the multiple slice images that correspond to the multiple image capture ranges.