The present invention is intended to convert a video input from a surgical microscope into a three-dimensional video. A microscope video processing device 100 includes: a microscope video acquisition unit that acquires a microscope video output from an surgical microscope 200; a video conversion unit that converts the microscope video acquired by the microscope video acquisition unit into a three-dimensional video; a surgical instrument position determination unit that determines the position of a surgical instrument in the three-dimensional video converted by the video conversion unit; a distance calculation unit that calculates a distance between a preset patient's preset surgery target region and the position of the surgical instrument determined by the surgical instrument position determination unit; and a video output unit that outputs to a display unit an output video in which distance information indicative of the distance calculated by the distance calculation unit is displayed in the three-dimensional video.
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