INFORMATION PROCESSING DEVICE, INFORMATION PROCESSING METHOD, AND INFORMATION PROCESSING PROGRAM

PROBLEM TO BE SOLVED: To provide an information processing device, an information processing method, and an information processing program which allow a group including a user who had belonged to the group in the past to be managed.SOLUTION: An information processing device includes a member search part 21 which registers a user who satisfies set conditions as a group member and updates, after the registration, a group member by the user who satisfies the conditions, and group information 13 which stores a user having been registered as a group member by the member search part 21, as a group member history after the update.