Provided is an editing device including an input material timeline area display control unit that executes control such that an input material timeline in which an event is arranged is displayed, using a material which is an element of selected content as the event, and an output material timeline area display control unit that executes control such that an output material timeline in which an event which is being edited or has been edited is arranged is displayed. The input material timeline and the output material timeline have a same time axis, and the input material timeline area display control unit controls a display of the input material timeline such that the event arranged in the input material timeline is expressed by the same time axis as the event arranged in the output material timeline.