An information processing apparatus for commodity registration includes a cart body, a weight sensor, a movement sensor, a code scanner, a display, and a control circuit. The control circuit is configured to detect change of a weight according to the weight sensor. Upon detecting the weight change, the control circuit determines whether the code scanner has read a commodity code within a predetermined time period before or after the weight change. If the code scanner has not read a commodity code within the predetermined time period, it is determined whether or not movement of the cart body, as detected by the movement sensor, satisfies a predetermined condition. If the movement satisfies the predetermined condition, the control circuit controls the display to display a registration alert screen.