1. A system for indoor navigation, which traces an indoor location through a mobile device, the system comprising: a global coordinate generator for dividing an indoor space, extracting a plurality of generated feature points where images photographed by cameras installed at predetermined locations within an area the mobile device is to be located overlap, and generating a global coordinate for each of the generated feature points; a database for storing information about the images and global coordinates of the generated feature points generated by the global coordinate generator; and the mobile device for extracting a plurality of acquired feature points from an image of a surrounding environment photographed by a camera included in the mobile device, comparing the acquired feature points with the generated feature points stored in the database, and estimating a global coordinate and direction of the mobile device based on any generated feature points that coincide with any acquired feature points.