Color printing service is an information service product that can be customized by both calling and called users to transmit additional graphic and textual content during the call process. Before, during, or after a voice call is connected, the system automatically pushes the user's pre-set color printed content (text, images, videos, etc.) to the other party's mobile phone screen, allowing the other party's user to see the relevant content, in order to showcase personality, share emotions, and transmit business information. The business is divided into two forms: client-side image color printing and non client-side text color printing.