A fan includes a number of fan blades, a casing, a first actuating device, a second actuating device, a camera, and a controlling system. The first actuating device drives the fan blades. The second actuating device makes the fan change direction, thus to adjust a direction of wind from the fan. The camera captures an image of a scene at front of the fan. The controlling system checks the image to determine whether there is a person in the image, and to determine a position of the person in the image and outputs a corresponding position signal to the second actuating device for controlling the fan to change the direction of the wind from the fan.