A surveillance method includes: an interrupt processing operation of determining whether an interrupt is generated and determining a type of the interrupt; a type-1 interrupt processing operation of, in response to determining that the interrupt is a type-1 interrupt, determining whether an event has occurred, and, in response to determining that the event has occurred, sending an event occurrence alarm to an outside of the surveillance apparatus using a second communicator, which transmits or receives data at a second frequency, and sending an image, corresponding to the event, acquired by an image sensor to the outside using a first communicator, which transmits or receives data at a first frequency higher than the second frequency; and a type-2 interrupt processing operation of, in response to determining that the interrupt is a type-2 interrupt, controlling the surveillance apparatus according to control information included in the type-2 interrupt, wherein the type-1 interrupt is an interrupt generated at a predetermined time interval.