A parking lot management device includes a memory and a processor including hardware. The processor is configured to identify a plurality of vehicles which enters a parking lot by analyzing an image which is captured at an entrance of the parking lot, to select parking positions which are different in the parking lot and in which moving routes from the entrance of the parking lot to the parking positions do not interfere with movement and parking of other vehicles in the parking lot for the plurality of vehicles, and to transmit the selected parking positions and the moving routes to the parking positions to the plurality of vehicles.