1. A video editing device comprising: a storage unit to store, in association with one another, each of a detection target, a similarity determination condition for determining a similarity of an original video content to the detection target, and a message to be displayed on an image of the original video content, the message including information about content in the image of the original video content on which the message is displayed a detection unit to determine in accordance with the similarity determination condition whether or not the detection target is included in the original video content; and a composite unit to add the message associated with the detection target to the original video content in a case where a determination result by the detection unit indicates that the detection target is included in the original video content.