Disclosed herein is an internal antenna module that is installed in a terminal and that can receive signals in both the FM and Bluetooth frequency bands so as to achieve a small-sized, slim terminal. The internal antenna module includes a polyhedral chip antenna configured to have a first radiant pattern and a coupling pattern formed thereon, a flexible circuit board configured to have a first conductive pad connected to the first radiant pattern, a second conductive pad connected to a coupling pattern, and a second radiant pattern connected to the first radiant pattern, and a signal switching unit formed between the second conductive pad and a ground, and configured to prevent any one of a first frequency band signal and a second frequency band signal, received through the chip antenna and the flexible circuit board, from reaching the ground.