1. A method for outputting consecutive characters in a video-recording mode, comprising: obtaining a first image and a second image from an object; comparing the first image with the second image to obtain a third image which is an overlapping part of the first image and the second image; removing the third image from the second image to generate a fourth image; merging the fourth image with the first image to generate a fifth image; and performing an optical character recognition (OCR) on the fifth image, to output the characters in the fifth image.