A user equipment (UE) and an operating method of the UE in a communication system are provided. The method includes registering the UE through a first cell using a first access technology; detecting a second cell using a second access technology; receiving a first data through the first cell using the first access technology; and receiving a second data through a second cell using the second access technology, wherein the first cell and the second cell are simultaneously active for the UE, and at least one of the first data and the second data is selectively received through at least one of the first cell and the second cell.