A method is provided for processing a video to be displayed on a head mounted display device mounted on a worker performing virtual work. A position, posture, and line of sight of the worker are acquired, and a three-dimensional model of a work object on which the worker performs virtual work and a three-dimensional model of the worker are displayed on a display screen according to the acquired position, posture, and line of sight. A distance visualization portion is displayed which linearly extends from a predetermined section of the three-dimensional model of the worker and connects the predetermined section and the three-dimensional model of the work object, to visualize a distance between the predetermined section and the work object.