A delivery management system comprises: a first receiving means that receives provisional information that is associated with true information relating to the delivery destination and is information different from the true information; a first specifying means that specifies first identifying information from the provisional information that is received by the first receiving means by referencing a first storing means that associates the first identifying information and the provisional information with each other and stores same; a second specifying means that specifies second identifying information from the first identifying information specified by the first specifying means by referencing a second storing means that associates the second identifying information and the first identifying information with each other and stores same; and a third specifying means that specifies the true information from the second identifying information specified by the second specifying means by referencing a third storing
