An order management apparatus holds storage rack information in which identification information of articles and identification information of storage racks holding the articles are registered, identifies identification information of storage racks holding articles identified by identification information of articles included in the received orders with reference to the storage rack information, creates order groups from the received orders to satisfy a condition that orders for which identification information on the same storage rack is identified belong to the same order group, so as to transport the storage racks in a minimum number of trips to the workstation, notifies the worker in the workstation of orders belonging to one of the created order groups, and sends a transport instruction to the transport vehicle to transport a storage rack holding an article in at least one order belonging to the order group the worker in the workstation is notified of.