1. A method for displaying an image based on a text in the image, including: a text extracting step, extracting text regions in the image to be displayed; a text occupancy amount calculating step, calculating an occupancy amount of the text in the image based on at least one of: a number of spelling errors, detected by a spell checker, in the text in the extracted text regions; a number of grammar errors, detected by a grammar checker, in the text in the extracted text regions; a number of the extracted text regions in the image; an average font size of characters in the extracted text regions; a percentage of an area of the extracted text regions with respect to an area of the image; a comparing step, comparing the calculated occupancy amount with a predetermined threshold; a display step, determining whether to display the image in a real size or a reduced size based on the comparing step, displaying the image in the real size of the image if the occupancy amount exceeds the predetermined threshold, and displaying the image in the reduced size if the occupancy amount does not exceed the predetermined threshold.