According to one embodiment, a reading device reads inherent information of a commodity from an attached RFID tag. The device includes antennas arranged at different vertical locations with respect to a table having a placing region. The antennas respectively transmit radio waves from different locations to the placing region. A specifying unit of the reading device can specify a commodity in the placing region based on the inherent information read through the antennas. A selection unit of the reading device can select one commodity to be moved from the placing region from commodities specified by the specifying unit if a container in which the commodities are contained is taken in the placing region. A guide unit of the reading device can display guide information for instructing a movement of the commodity selected by the selection unit from the placing region on a display.