An apparatus includes an editing area display unit configured to display a screen including an editing area that enables a user to edit a document, a temporary storage area display unit configured to display a temporary storage area which differs from the editing area and temporarily displays a list of reduced images of editing materials, and a layout editing unit configured to edit the document by adding a material selected from the editing materials displayed in the temporary storage area. When a currently edited document is transferred to a file, a control unit stores a path of a material displayed in the temporary storage area in relation to the document transferred to the file. When a document file stored in relation to the path of a material area is newly opened, the control unit determines whether the newly opened document file is related to the material in the temporary storage area.