Disclosed is an inundation and overflow prediction system, and particularly, when there is provided an inundation and overflow prediction system, which can visually express the areas and degree of inundation and overflow on an orthophotograph, a Digital Elevation Model, and a Digital Surface Model based on images captured by a drone, which can reflect the latest environment and provide accurate numerical data, visualized information on inundated areas may be used in real-time for management of land to identify areas vulnerable to inundation and overflow and quickly respond to disasters, and objective information on numerical data may be provided in selecting locations for installing safety facilities against flood. Additionally, reports and documents, drawings for creating data, and visible simulation values may be output to supports works, and, there is an effect of constructing and utilizing a database regarding maintenance of social infrastructures through continuously learning of drone images.