Abstract: A multimedia playing system for automatically notifying abnormal situations has a TV dongle and a network security camera connected to the TV dongle through network. The TV dongle has an email processing server module. The network security camera has an email transmitting module. When the network security camera detects an abnormal situation, an event message is transmitted to the email processing server module. The email processing server module accordingly generates a command. According to the command, the TV dongle transmits a control signal to control a digital TV to immediately display the abnormal situation. Therefore, the multimedia playing system automatically informs a user of the occurrence of the normal situation.