1. A method of outputting regional information in a user device including a processing unit, a transmitting/receiving unit, and an output unit, the method comprising: obtaining a regional image through the processing unit; transmitting the regional image to a server through the transmitting/receiving unit; receiving regional information on a geographical position that a regional image feature extracted from the regional image represents through the transmitting/receiving unit; and outputting the regional information through the output unit, wherein the geographical position represents one feature matching to the regional image feature, which is selected from a plurality of features representing a plurality of regional images.