Article printing systems, materials printing apparatus, and article printing system control program

A material printing system includes a reference setting unit for setting any given version of material data as reference material data, among plural versions of material data concerning a particular meeting, in accordance with a user's instruction, a printing history search unit for obtaining a printing history of material data concerning the particular meeting for a participant in the particular meeting, and an operation unit for calculating the difference between material data printed by a participant in the particular meeting and the reference material data concerning the particular meeting, and a printing unit for printing differential data corresponding to the difference.