A license management device comprising: a license identifier generator unit configured to generate a license identifier and license information corresponding to a purchased group of one or more application programs, the license identifier being associated with a group identifier of the purchased group of the application programs, the license identifier being associated with the license information corresponding to the purchased group of the application programs; a group information storage unit configured to store the group identifier of the purchased group of the application programs in association with respective product identifiers of the application programs of the purchased group; a license information storage unit configured to record the license identifier corresponding to the group identifier of the purchased group of the application programs in association with the respective product identifiers of the application programs of the purchased group; a determination unit configured to determine, on receiving the generated license identifier associated with at least one of the application programs of the purchased group, whether the received license identifier associated with the at least one of the application programs of the purchased group is recorded in the license information storage unit; and a first sending unit configured to send via a network, if the determination unit determines that the license identifier received by the determination unit is recorded in the license information storage unit, a license file corresponding to the recorded license identifier associated with the at least one of the application programs of the purchased group to provide a permission to use the at least one of the application programs of the purchased group associated with the recorded license identifier; wherein, when the license file corresponding to the recorded license identifier associated with the at least one of the application programs of the purchased group is sent via the network, the device is configured to record in the license information storage unit that the license corresponding to the recorded license identifier associated with the at least one of the application programs of the purchased group is in use, and the device is configured such that modification, in the group information storage unit, of the product identifiers associated with the purchased group is prohibited if the license corresponding to the recorded license identifier associated with the at least one of the application programs of the purchased group is recorded as being in use in the license information storage unit; and wherein the device is further configured such that deletion of the group identifier of the purchased group of the application programs from the group information storage unit is prohibited. a license identifier generator unit configured to generate a license identifier and license information corresponding to a purchased group of one or more application programs, the license identifier being associated with a group identifier of the purchased group of the application programs, the license identifier being associated with the license information corresponding to the purchased group of the application programs; a group information storage unit configured to store the group identifier of the purchased group of the application programs in association with respective product identifiers of the application programs of the purchased group; a license information storage unit configured to record the license identifier corresponding to the group identifier of the purchased group of the application programs in association with the respective product identifiers of the application programs of the purchased group; a determination unit configured to determine, on receiving the generated license identifier associated with at least one of the application programs of the purchased group, whether the received license identifier associated with the at least one of the application programs of the purchased group is recorded in the license information storage unit; and a first sending unit configured to send via a network, if the determination unit determines that the license identifier received by the determination unit is recorded in the license information storage unit, a license file corresponding to the recorded license identifier associated with the at least one of the application programs of the purchased group to provide a permission to use the at least one of the application programs of the purchased group associated with the recorded license identifier;