An inventory information collecting unit automatically collects inventory information including inventory information regarding software installed in each of a plurality of computers within an organization. A usage-state information collecting unit updates a software license usage number which represents the number of software licenses used in each section of the organization. When the sum of the software license usage numbers of the respective sections of the organization exceeds a software license holding number which represents the number of software licenses owned by the organization, a license purchasing unit generates a purchase transaction for purchasing software licenses, the number of which is equal to the difference between the sum and the software license holding number and transfers a purchase expense to relevant sections.