1. A method for locating a medical instrument during an intervention performed on a live body, comprising: continuously obtaining a first position information of the instrument in the body by a locating system; intermittently recording two two-dimensional X-ray images of the body by an X-ray image recording system with a coordinate system of the X-ray image recording system being registered with a coordinate system of the locating system; determining a second position information of the instrument in the body from the X-ray images; comparing the second position information with the first position information; correcting the first position information based on the comparison; and performing the intervention according to the corrected first position information of the instrument.