According to one embodiment, a reading device includes a communication interface for communication with a commodity registration device. A commodity reader of the reading device reads commodity information from a commodity and the commodity information can be used for identifying the commodity. An output device signals that the commodity reader has read commodity information. A controller causes the communication interface to transmit the commodity information read by commodity reader, initialize the communication interface when it is determined that transmission of the commodity information has failed, and signal a communication failure when transmission of the commodity information has failed.