MONITORING SYSTEM MONITORING PERIPHERY OF MOBILE OBJECT, METHOD OF CONTROLLING MONITORING SYSTEM, AND STORAGE MEDIUM

A monitoring system that monitors periphery of a shovel moving on ground and reports a tumble risk of the periphery of the shovel to an operator includes: a risk determination unit configured to determine a tumble risk in a case of movement of the shovel to the periphery based on distance information measured by a first sensor that is mounted on the shovel and measures a distance to a ground object including the ground in the periphery of the shovel and slope information measured by a second sensor measuring a slope of the shovel; and a display video generation unit configured to generate and output an image indicating the tumble risk determined by the risk determination unit.