A TV converter box is the set top box that comes with a cable subscription, and it takes the signal coming in through the copper cable and turns it into something the TV can understand. He would use the converter box to switch channels. The internet box is a bit different, and would give him the cable internet access. Often times companies will combine the two and offer a converter box and a cable modem. He would get more channels on the hybrid cable TV and internet box, but he'd have to pay for the internet access to use that.