Provided is a network camera, including: an event detector configured to detect an event; an image sensor configured to capture an image in response to the detected event; a storage configured to store image data of the captured image; a transceiver configured to transmit and receive the image data over a network; a controller configured to control the event detector, the image sensor, the storage, and the transceiver, to select a single network mode from among a plurality of network modes based on whether power is supplied from an outside, and to configure the network based on the selected network mode; and a power source configured to supply the power to the event detector, the image sensor, the storage, the transceiver, and the controller.