A method for sorting waste, in which waste or recyclable material intended for sorting is brought in waste bags to a sorting apparatus, which includes a conveyor, from which the waste bags belonging to different waste components are separated from each other by guiding them into the containers according to the waste components or to further processing. A waste bag, an identifier arranged in connection with it and/or the content of the waste bag is identified with a sensor system, which includes a number of sensors monitoring different properties, which sensors essentially simultaneously read and/or identify a waste bag, an identifier arranged in connection with it and/or the content of the waste bag when the waste bag is transferred on the conveyor via the reading area of the sensors, and in which method on the basis of information coming from the sensors the waste bags are sorted into different waste components using one or more handling devices of the sorting apparatus. The invention also relates to an apparatus and to a system.