Abstract: The present invention provides an apparatus and method for detecting a location of an underground facility, which calculates a gauss value at each depth of a magnetic marker, measures a magnetic field at each depth through each sensor based on the calculated gauss values, extracts factors by performing a factor analysis on the measured magnetic fields, obtains extracted variable values by performing a regression analysis on the extracted factors, stores the extracted variable values in a database, and determines a location of the magnetic marker based on the stored extracted variable values and the values measured by the sensors in real time.