A delivery management system includes: a first accepting unit which accepts provisional information corresponding to true information regarding a delivery destination, and being different information from the true information; a first specifying unit which specifies a first identification information based on the provisional information accepted by the first accepting unit, with referring the first storage unit storing the first identification information and the provisional information while associating them; a second specifying unit which specifies a second identification information based on the first identification information specified by the first specifying unit, with referring the second storage unit storing the second identification information and the first identification information while associating them; and a third specifying unit which specifies the true information based on the second identification information specified by the second specifying unit, with referring a third storage unit storing the second identification information and the true information while associating them, wherein the first storage unit, the second storage unit and the third storage unit are located at different places from one another.