Abstract: An information processing apparatus includes a scanner device for reading documents M as image information, and a filing device for separating the image information thus read into groups and filing each group of information as a block of document data. The filing device has ROM storing a monochrome-sheet-using separation designating routine which is programmed to extract a monochrome sheet such as entirely white or black sheet as a separating sheet by detecting whole colors in a specified area of a sheet and to designate a grouping of document data by the separating sheet. With this structure, it is possible to use a plain monochrome sheet such as an ordinary white sheet as the separating sheet for separating a plurality of documents into groups for filing each group as a block of document data. In addition, since there is no need to provide a light emitting section and a light receiving section for judging the separating sheet, the manufacturing cost is reduced.