A method for notifying a Real-Time Streaming Protocol (RTSP) event includes: monitoring an event state; and sending a notification indicative of a change of the event state to an event state receiving device if detecting the change of the event state. A computer program and a computer-readable storage medium are provided to enable a computer to perform the steps of the method for notifying an RTSP event. An apparatus for notifying an RTSP event includes: an event state monitoring unit, adapted to monitor an event state; and a message sending unit, adapted to send a notification indicative of a change of the event state when the event state monitoring unit detects the change of the event state. A system for notifying an RTSP event includes the RTSP event notifying apparatus.