The invention relates to a monitoring or listening method used for a mobile device with audio function or video function, which comprises: responding a calling from mobile equipment at an occasion, wherein the occasion is provided with the mobile device with the audio function or the video function for monitoring or listening one area of the occasion; determining that whether the calling corresponds to an appointed identity or not, wherein the appointed identity is used for activating the mobile device with the audio function or the video function to monitor or listen the area of the occasion; responding the calling from the mobile equipment to activate the mobile device with the audio function or the video function if the calling corresponds to the appointed identity; and monitoring or listening the area of the occasion by the mobile device with the audio function or the video function after responding the calling. The method makes up the disadvantage that the cost for implementing and maintaining a static monitoring or listening system is high as a user can only see the monitored position from the central monitoring point, thereby realizing the wide application of the monitoring or listening system with low cost and convenient use.