Connect Arduino MEGA 2560 to Arduino Robot

Hi, Arduino lovers:

I'm 13 (from Spain) and I've recently bought an Arduino Robot (http://arduino.cc/en/Main/Robot). I also have an Arduino MEGA 2650 which I know how to use, but I'd like to integrate the potential of the MEGA with the Robot.

When I'm talking about integrate, I mean like if I can receive information from the Robot to the MEGA so that the MEGA can interpretate more complex data, and also that the MEGA can send information to the Robot. I'd like to do that because of the potential of the ATmega2560.

Thanks, Miguel Ángel An Arduino fan