A task performing method for a cleaning robot, according to the disclosure, comprises the operations of: photographing an object in proximity to the cleaning robot includes obtaining recognition information of the object included in the photographed image, by applying the photographed image to a trained artificial intelligence model, obtaining, from among a plurality of sensors, additional information of the object by using a result obtained by detecting the object by at least one sensor selected, based on the recognition information of the object, and performing a task of the cleaning robot based on the additional information of the object. The trained artificial intelligence model, for example, a deep learning neural network model, in which a plurality of network nodes having weights are located in different layers so as to exchange data according to a convolution relationship, can be used, but is not limited to the aforementioned example.