Abstract: A technique for reducing mismanagement of high- and low-order to-do related items, saving a user the trouble of the management of those items, and allowing him or her to more easily recognize the correlation between the high- and low-order to-do related items. A task item C serving as an exemplary high-order to-do related item and a grace period of the task item C, and a schedule item E serving as an exemplary low-order to-do related item associated with the task item C and occurring as a binding period during the grace period of the task item C and the binding period thereof are input to a management server. These to-do related items input are associated with each other via a path and stored in a database, thereby making a uniform interlinked management of the task and the schedule.