1. An apparatus detecting landmarks with a mobile device, the apparatus comprising: a storage unit to store rules of landmarks that correspond to connection relations among items representing a user's living patterns; an analysis unit to statistically analyze collected log information representing a current living pattern of the user; a landmark probability inferring unit to infer in probability the landmarks according to the analyzed log information based on the stored rules; and a landmark selection unit to select a final landmark by mutually analyzing the stored rules and the inferred landmarks.