Abstract: A medium storing a program for causing a computer to execute: specifying a package to be delivered by a first moving body from a first base to a second base in a first plan; specifying a third base where delivery of the package from the first base to the third base is allocatable to a second moving body in the first plan and where delivery of the package from the third base to the second base is allocatable to a third moving body in the first plan; and creating a second plan by replacing the delivery of the package from the first base to the second base by the first moving body with the delivery of the package from the first base to the third base by the second moving body and the delivery of the package from the third base to the second base by the third moving body.