1. A mobile device for detecting landmarks, the mobile device comprising: a storage unit to store rules of landmarks that correspond to connection relations among items representing a user's living patterns and items representing a user's position; an information collection unit to collect log information representing a current living pattern of the user and position information representing a position of the user; an analysis unit, installed within the mobile device, to analyze the log information and the position information collected using the mobile device; and a landmark selection unit to select a final landmark by mutually analyzing the stored rules and the log information and the position information.