8. A non-transitory recording medium recording a control program for controlling an operation of an image processing apparatus, said control program causing said image processing apparatus to: generate a first additional image based on an image in a designated region of a first document, generate a second additional image showing a difference between said first document and a second document; said second document being a revision of said first document; and register said first additional image and said second additional image on another device in association with a marker image indicating a revision stage of said first document.
8. A non-transitory recording medium recording a control program for controlling an operation of an image processing apparatus, said control program causing said image processing apparatus to: generate a first additional image based on an image in a designated region of a first document, generate a second additional image showing a difference between said first document and a second document; said second document being a revision of said first document; and register said first additional image and said second additional image on another device in association with a marker image indicating a revision stage of said first document. 12. The non-transitory recording medium according to claim 8 , wherein said control program further causes said image processing apparatus to set information for said second additional image for each user of a plurality of users, said information showing whether browsing is allowed or not when said second document is displayed for a user of the plurality of users.