The present disclosure provides a system constructed by connecting a mobile terminal and a service providing device, and a service providing method, wherein the service providing device and the mobile terminal are directly connected via an interface of the mobile terminal; the service providing device provides a service independently or through collaboration between the service providing device and various parties such as the mobile terminal and/or the background server based on the service information parsed and extracted the code information, identification information of any one or more parties among the user, the first mobile terminal, and the service providing device, and/or information bound to the identification information. Through active code scanning or passive code scanning or a combination of the two, the present disclosure may conveniently and quickly implement sensing access and effectively enhance security for operations such as mobile payment, etc.