The commodity selection assisting apparatus includes a camera, a size detection portion, a search portion, and a display control portion. The camera captures an object and outputs image data representing an image of the object. The size detection portion detects an object size which is a size of a specific part in the image of the object, from the image data. The search portion searches for, from among a plurality of commodity data each including commodity size data representing a size of a specific part of a commodity and commodity identification information, purchase candidate data including the commodity size data corresponding to the object size. The display control portion causes a display device to display the purchase candidate data.