Disclosed is a cooking apparatus for heating a substance to be cooked. A cooking apparatus according to one embodiment of the present invention comprises: a transmission antenna for irradiating the substance to be cooked with beamformed electromagnetic waves; a reception antenna for receiving reflected waves reflected from the substance to be cooked; and a controller for determining the temperature of the substance to be cooked corresponding to the received reflected waves on the basis of the property in which the electromagnetic waves, with which the substance to be cooked is irradiated, are reflected differently in accordance with the temperature of the substance to be cooked.