A surveillance system including a surveillance server and at least one network camera is provided. The network camera includes: a camera configured to capture images of a monitoring area; a communication interface configured to communicate with a server and a beacon terminal; and a processor configured to transmit a first beacon signal to the beacon terminal to receive a second beacon signal corresponding to the first beacon signal from the beacon terminal, generate beacon information and image information in response to receiving the second beacon signal, and transmit the beacon information and the image information to the server via the communication interface, wherein the beacon information includes location information of the beacon terminal, and the image information includes an image of a monitoring target that carries the beacon terminal.