A navigation service system and a navigation service method are provided. The navigation service system includes a mobile device, and a web server for communicating with the mobile device, the mobile device includes a display unit for displaying at least one navigation widget icon, a wireless communication unit for executing wireless communications with the web server, a Global Positioning System (GPS) module for receiving location information of the mobile device, a memory unit for storing a navigation widget, and a navigation widget controller for controlling the wireless communication unit to transmit the location information of the mobile device to the web server, for controlling the wireless communication unit to receive map data related to the location information from the web server, and for controlling the display unit to display the map data and the location information.