Provided is a proofreading device capable of accepting proofreader's marks, which includes: a user attribute identification section configured to identify an attribute of a user; a storage section configured to store proofreader's mark sets and attributes of users in association with each other and to store intermediate mark set to be used to place the proofreader's marks having the same meaning among the proofreader's sets in correspondence to each other; a proofreader's-mark-set selection section configured to a proofreader's mark set corresponding to the attribute of the user; a proofreader's mark conversion section configured to convert the proofreader's marks, added to a document by a first proofreader, into intermediate marks, to convert the intermediate marks into the proofreader's marks of the proofreader's mark set selected on the basis of the attribute of a second user, and to cause a display section to display the converted proofreader's marks together with the document.