1. An image processing apparatus configured to manage documents, said image processing apparatus comprising: a memory configured to store an instruction; and a processor configured to execute said instruction, said processor being further configured 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 the 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.
1. An image processing apparatus configured to manage documents, said image processing apparatus comprising: a memory configured to store an instruction; and a processor configured to execute said instruction, said processor being further configured 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 the 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. 3. The image processing apparatus according to claim 1 , wherein said processor is further configured to synthesize an image showing said difference between said first document and said second document with said first additional image when an area of said difference between said first document and said second document is included in said designated region of said document.