Looks like it could be speaker wire for stereo, left/right channels
Is there another end or are there speakers in the ceiling or walls?
Do you have a volt meter? You can use that to match the ends, twist one set together and see which one is closed.
If that was connected to a wall jacks, someone is an asshole for not leaving it. The part tools to strip and rebuild the connectors aren't expensive but they a one and done tool for a diy-er. Maybe you know someone that can borrow you the tool.
These days, there are a lot of wireless options so you could also shove it the wall and buy a blank plate to cover it.