A method for monitoring a state of wearing safety protective equipment according to an embodiment includes receiving an image from a site monitoring device installed at an operation site determining whether a work performed in a monitoring area corresponds to a dangerous work by analyzing the image; detecting a target worker and a body area of the target worker when it is determined that the work corresponds to the dangerous work as a result of determining whether the work performed in the monitoring area corresponds to the dangerous work; determining a type of safety protective equipment required for the target worker; and determining the state of the target worker wearing the safety protective equipment.