Cooking device and method of controlling the same

A cooking device, comprising:

• a cavity forming space configured to receive food for cooking;
• a heater provided at one side of the cavity, the heater including a plurality of heating elements;
• a sensing device provided in the cavity, wherein the sensing device includes a non-contact type IR sensor arranged to sense a temperature of the food and a temperature of a support;
• and
• a controller configured to estimate the size of the food based on both the temperature of the food and temperature of the support sensed by the sensing device, and to operate one or more of the plurality of heating elements based on the estimated size of the food to perform a cooking operation, wherein the controller is configured to initially turn on all of the plurality of heating elements, and wherein the controller is programmed to turn off at least one of the plurality of heating elements when the difference between the temperature of the support and the temperature of the food is less than a prescribed difference.