A Wireless-Fidelity (Wi-Fi) service method and system are provided. A beacon message and probe response message may contain a service information field storing device information. Wi-Fi devices can exchange information on supported functions with each other and one Wi-Fi device may identify functions supported by another Wi-Fi device. Hence, a Wi-Fi connection can be set up through automatic provisioning. The method includes receiving, by a first Wi-Fi device in non-Access Point (AP) mode, messages from nearby Wi-Fi devices operating in AP mode, analyzing a service information field of each received message, determining a second Wi-Fi device that is manufactured by the same manufacturer as the first Wi-Fi device and is capable of supporting a requested service, establishing a connection with the second Wi-Fi device through Wi-Fi Protected Setup (WPS) based on automatic provision, and sending data associated with the requested service to the second Wi-Fi device for a Wi-Fi service.