a method for controlling antennas of a mobile terminal device such as a laptop pc and a handheld pc without degrading communication speed or quality and a mobile terminal device having such control means are provided . the method comprises determining the usage of the mobile terminal device , determining an antenna to be disabled among the plurality of antennas according to the usage that is determined by the determining of usage , and disabling the antenna disabling of which is determined by determining of an antenna to be disabled , wherein the determining of usage determines usage based on the display orientation of the display unit of the mobile terminal device .