An apparatus comprises a module which stores document information to which content that includes link character strings linked to other items on an item basis is caused to correspond, a first display control module which displays content on an arbitrary item stored as first content according to a user operation, a second display control module which lists the link character strings included in the displayed first content and displays them together with the first content, a selection module which selects, according to a user operation, a link character string displayed, and a third display control module which displays content on an item stored in such a manner that the item is linked to the selected link character string.