1. A method for editing a page of a document containing a synthesis of a multi-line text sentence having a predetermined line pitch and character pitch and a desired graphic figure by using a document editing apparatus including an output unit and a display unit having a display screen, in which the line pitch and the character pitch of the text sentence displayed on each line of said display unit are different from the character line pitch and the character pitch of the text sentence produced on each line by said output unit, said method comprising: a first step of designating a first area on said display unit for accommodating a desired graphic figure within the same page; a second step of determining coordinates of the designated first area and providing a layout of the text sentence so that the text sentence will appear in an area of the display screen of said display unit outside said first area; a third step of displaying on the display screen of said display unit the text sentence whose layout is provided in said second step; a fourth step of converting said first area into a second area having a size which is defined on the basis of the relationship between the line pitch and the character pitch in said display unit and the line pitch and the character pitch in said output unit, respectively; a fifth step of forming in the second area a desired graphic figure having longitudinal and lateral dimensions such that the entire figure can be included within the second area; and a sixth step of outputting from said output unit the graphic figure formed in said fifth step together with the text sentence whose layout is provided in said second step.