A commodity is learnt and stored in an HDD on the basis of a commodity image captured by an image capturing section. Commodity registration is carried out through a key input. The commodity which is not stored in the HDD yet is stored in the HDD as commodity data when the commodity registration is carried out through a key input, in this way, the registration as a learnt commodity is realized. Then the target commodity captured by the image capturing section is read from the commodity data stored in the HDD. In this way, the commodity image can be added and learnt based on that the unregistered commodity is input through a key operation by the operator.