A self-propelled apparatus includes: a self-propelled platform having a recessed chamber located in the bottom side, a control unit mounted in the self-propelled platform for controlling the moving path of the self-propelled platform in a predominantly grid-pattern that causes the self-propelled platform to mainly move in predominantly straight lines, a battery, one or multiple germicidal ultraviolet lights exhibiting an elongated shape and mounted in the self-propelled platform within the recessed chamber in such a manner that the longitudinal axis of the germicidal ultraviolet lights is kept in parallel to the linear moving direction of the self-propelled platform, and obstacle sensors. The self-propelled apparatus utilizes a wireless module for wireless communication with an external smart device that has built therein an application software for controlling and displaying the operating status of the self-propelled apparatus.