To easily grasp the relation among contents.

An information processing device holds first information to which a second content is related ahead of a first content in a first axial direction, second information to which a third content is related ahead of the first content in a second axial direction, and third information having a fourth content related ahead of the third content in a third axial direction and also additionally holds fourth information to which the first content is related behind the fourth content in the second axial direction and fifth information to which the second content is related behind the fourth content in the second axial direction, and holds one of the fourth information and fifth information according to an instruction to add the fourth content and displays the fourth content such that it can be discriminated whether a content displayed when a content displayed according to which one is held is switched backward along the second axis is the first content or second content.