20. A method of automatically generating an index page in an image forming apparatus, the method comprising: receiving data associated with a document having one or more pages and determining a text area in the one or more pages with a text/image separation apparatus; determining one or more content indicating texts from among the text area in the one or more pages by selecting characters of the content indicating texts based on comparing a size of characters in the text area with a predetermined size threshold that is set as an average value of preset character properties calculated on a variation of the preset character properties, and grouping selected characters together based on relative proximity to one another with an index determination apparatus; and automatically generating the index page for the document including the one or more content indicating texts with an index page creation apparatus, wherein the determining of the one or more content indicating texts from among the text area in the one or more pages comprises: receiving separated symbols of the text area; and comparing the separated symbols to one or more predetermined size parameters to determine whether the separated symbols are content indicating symbols, and grouping adjacent ones of the content indicating symbols together; and determining the grouped content indicating symbols as the content indicating texts for the index page.
20. A method of automatically generating an index page in an image forming apparatus, the method comprising: receiving data associated with a document having one or more pages and determining a text area in the one or more pages with a text/image separation apparatus; determining one or more content indicating texts from among the text area in the one or more pages by selecting characters of the content indicating texts based on comparing a size of characters in the text area with a predetermined size threshold that is set as an average value of preset character properties calculated on a variation of the preset character properties, and grouping selected characters together based on relative proximity to one another with an index determination apparatus; and automatically generating the index page for the document including the one or more content indicating texts with an index page creation apparatus, wherein the determining of the one or more content indicating texts from among the text area in the one or more pages comprises: receiving separated symbols of the text area; and comparing the separated symbols to one or more predetermined size parameters to determine whether the separated symbols are content indicating symbols, and grouping adjacent ones of the content indicating symbols together; and determining the grouped content indicating symbols as the content indicating texts for the index page. 21. The method of claim 20 , further comprising: printing the document having the one or more pages along with the generated index page.