When playing on a video game in the U.S. online, how do I get internet good enough to play on Austrailian servers with friends?

I play black ops 3 on the playstation 4. Recently i have met these people from Austrailia through streaming. Well, when I attempt to play with them while they host, in their games, i have a constant 2 bar connection. When i go to kill an enemy there is about a .5 second delay between the time the bullet comes from my gun and the time it actually hits the enemy. As you may know, this can affect game play by a lot (i have started to be able to get used to it). Is there something i need to buy to increse connection? If its anything i can solve i will do it.

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