The objective is to provide a store performance management device, a store performance management method, and a store performance management program that can automatically adjust store status on a monthly basis, taking into account changes in store conditions during the period, and provide data in a monthly trend format to achieve a clear overview. [Solution] Based on the store master and the monthly period master, store status work is obtained, which sets the store status for each store in each month of the target period. Based on the performance data and the store status work, monthly performance data is obtained, which sets the performance amount for each store for each month and store status in the target period.