A system for managing a selling system for shipping out an item from a warehouse or a nearest base associated with a delivery destination, includes an instruction unit configured to, before receiving an order placement for an item from a customer, transmit, to a warehouse server associated with the warehouse or a relay base server associated with a relay base, a transportation instruction for transporting the item to the nearest base from the warehouse or the relay base, and to, after receiving the order placement for the item from the customer, transmit, to a nearest base server associated with the nearest base, a submission instruction for submitting the ordered item to the customer.