Provided are a monitoring system having a personal information protection function and a method thereof. That is, according to the present invention, when the motion of the object is detected in the monitoring area where the privacy mode is set, the server provides metadata for the detected motion of the object to the monitoring center, and the monitoring center displays an avatar corresponding to the metadata on a predetermined background instead of the image associated with the monitoring area, thereby personal information protection is reinforced and reliability for the entire system is enhanced.