Clone detection method, and mobile terminal and mobile communication system using the same

A clone terminal detection method is disclosed. The clone detection method for a mobile terminal includes: determining, when a call request is made, by the mobile terminal, a current location and time; sending the current location and time data to a mobile communication system; receiving a pre-stored location and time data of the mobile terminal from the mobile communication system; computing a travel speed of the mobile terminal using the current location and time data and the pre-stored location and time data; comparing the computed travel speed with a preset threshold speed; and determining, when the travel speed is greater than or equal to the threshold speed, that the mobile terminal is a clone terminal.