Abstract: In entering a text in a document processing apparatus such as a word processor, an operator directs the document processing apparatus to implement a shading process for an intended portion in the text. In response to the operator's instruction, shading edit specifiers are inserted in the text. The text including the shading edit specifiers is stored temporarily in an external document file storage. When the text is read out of the document file storage and outputted through an output unit, the shading process is implemented for the text portion enclosed by the shading edit specifiers in the text. Even if the text portion between the shading edit specifiers is revised through a re-editting process for the text by the operator, the shading process takes place invariably for the revised text portion.