A system, device and method for communication control in a dual transfer mode are disclosed. The method includes performing a voice call by a portable terminal, based on a dual transfer mode, requesting to download data from a server by the portable terminal, determining whether voice information exists to be transmitted to the portable terminal, allocating data intended to be transmitted to the portable terminal, to time slots previously allocated to transfer voice information, if voice information does not exist, and transmitting the allocated data to the portable terminal.