Using Multiple Speakers on Receiver

I just bought a house that has speakers throughout, seven if memory serves me correctly. My receiver has spots for two speakers. The speakers are in the ceilings of different rooms but all of the wires end at the same location. The previous owner said to get some type of bridge at Best Buy. I went by there and the guy was not too helpful.

Is there some type of 'bridge' or device I can plug the various room speaker wires into and then hook it to receiver/tv.

TIA