1. An image processing method, comprising: receiving information of starting a first camera and a second camera simultaneously to perform photographing; obtaining a first focusing parameter for the first camera and a second focusing parameter for the second camera; using the first camera to photograph and obtain a first image according to the first focusing parameter; using the second camera to photograph and obtain a second image according to the second focusing parameter; obtaining a similarity between an edge area of the second image and a position that accommodates the second image in the first image; synthesizing the second image with the first image when the similarity is greater than or equal to a threshold, wherein synthesizing the second image with the first image comprises adjusting the edge area of the second image and the position that accommodates the second image in the first image to decrease a difference between the edge area of the second image and the position that accommodates the second image in the first image, and wherein synthesizing the second image with the first image comprises adjusting hue, saturation, contrast, and brightness at the edge area of the second image and the position that accommodates the second image in the first image; adjusting one of the first image and the second image when the similarity is less than the threshold, wherein adjusting the one of the first image and the second image comprises adjusting the one of the first image and the second image to increase the similarity between the edge area of the second image and the position that accommodates the second image in the first image, and wherein adjusting the one of the first image and the second image comprises adjusting color, hue, saturation, contrast, curve, and color level of the one of the first image and the second image; and displaying the first image and the second image simultaneously.