How can i seperate serial channel and bluetooth channel?

I'm newbie of Arduino and I hava a Romeo BLE.
I have a project the communication between Android mobile and Arduino via BLE.
But Romeo BLE use same hardware serial port to send BLE packet to mobile and to show the debug message.

I want to seperate two serial channel.
- Serial port (USB) : to debug Arduino board
- BLE channel : to communicate with mobile

How can I do that?

Thanks.