An apparatus and a method for measuring reception power of a base station in a mobile communication terminal having at least two Subscriber Identity Module (SIM) cards is disclosed. The apparatus includes a first terminal unit associated with a first SIM card and a terminal unit associated with each of the remaining at least two SIM cards. The first terminal unit measures a reception power of at least one base station when the mobile communication terminal operates in an idle mode. The terminal units associated with the remaining at least two SIM cards shares the reception power of the at least one base station measured by the first terminal unit.