A report management system includes: a first receiving unit that receives input of report identification information assigned to each of one or more reports to be collectively delivered to a receiver from a sender; an assigning unit that assigns group identification information to a group of the one or more reports to be collectively delivered; a registration unit that register, in a storage unit, the group identification information and each piece of the report identification information; an attached document generation unit that generates an attached document that is a document including the group identification information; a second receiving unit that receives, upon reception of one or more reports by the receiver from the sender together with the attached document, input of the group identification information included in the attached document received by the receiver; and an output unit that outputs information indicative of a result of comparison.