an image processing system includes an image input section , a first character - extracting section , a second character - extracting section and a synthesizing section . the image input section inputs images which are linked to each other in time series manner . the first character - extracting section extracts a character from a first image input by the image input section . the second character - extracting section extracts a character from a second image input by the image input section . the synthesizing section generates a character string in accordance with the character extracted by the first character - extracting section and the character extracted by the second character - extracting section .