| 摘要 |
A server comprises: a storage unit for storing store position information; a position information acquisition unit for acquiring device position information; a distance determination unit for determining whether a distance between a store and a device is less than a first length on the basis of the store position information and the device position information; and a reward providing unit for providing a first reward to the device when the distance between the store and the device is less than the first length, wherein the reward providing unit provides a second reward to the device when the distance between the store and the device is less than a second length, wherein the second length may be less than the first length. |
