A fire extinguishing device is configured to, in response to a location signal from a fire detector: move to a first reference location; detect a fire and generate a thermal image, and calculate a target direction based on a line of sight and the thermal image; rotate such that the line of sight is aligned with the target direction, and detect the fire and generate a first reference image; move in the target direction to a second reference location, and detect the fire and generate a second reference image; calculate a distance to fire and a height of the fire; move to a location within a predetermined range from the fire, move a tube to a spraying position based on the height of the fire, and discharge an extinguishing agent.
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