A method of fulfilling an order, the method comprising: determining, by circuitry of an information processing apparatus, the order to be processed; selecting, by the circuitry of the information processing apparatus, an operator station where the inventory order will be fulfilled, a rack that includes an item required to fulfill the inventory order, and a vehicle to transport the rack to the operator station; transmitting, by the circuitry of the information processing apparatus, at least a portion of a transportation path to the selected vehicle; monitoring, by the circuitry of the information processing apparatus, locations of the selected vehicle along the transportation path based on marker information received for each marker (20a-20d) of a plurality of markers that is detected by the selected vehicle, wherein the plurality of markers (20a-20d) includes first and second navigation markers disposed at predetermined positions along the transportation path between an initial location of the rack and a location of the operator station; in response to a determination that the selected vehicle has arrived at the first navigation marker, transmitting to the selected vehicle, by the circuitry of the information processing apparatus, movement information that provides a direction and distance to the second marker; and characterized in that the method comprises, transferring, by the circuitry of the information processing apparatus, control of movement of the vehicle to an operator station when the vehicle is in a station queue of the operation station, wherein an end point of the transportation path is the operator station. determining, by circuitry of an information processing apparatus, the order to be processed; selecting, by the circuitry of the information processing apparatus, an operator station where the inventory order will be fulfilled, a rack that includes an item required to fulfill the inventory order, and a vehicle to transport the rack to the operator station; transmitting, by the circuitry of the information processing apparatus, at least a portion of a transportation path to the selected vehicle; monitoring, by the circuitry of the information processing apparatus, locations of the selected vehicle along the transportation path based on marker information received for each marker (20a-20d) of a plurality of markers that is detected by the selected vehicle, wherein the plurality of markers (20a-20d) includes first and second navigation markers disposed at predetermined positions along the transportation path between an initial location of the rack and a location of the operator station; in response to a determination that the selected vehicle has arrived at the first navigation marker, transmitting to the selected vehicle, by the circuitry of the information processing apparatus, movement information that provides a direction and distance to the second marker; and characterized in that the method comprises, transferring, by the circuitry of the information processing apparatus, control of movement of the vehicle to an operator station when the vehicle is in a station queue of the operation station, wherein an end point of the transportation path is the operator station.