Noob question, but I need to know.

Hello guys,
First please excuse mine bad english, I still learning to speaking english but I try mine best with little help from google translate ( n_n)

Second, I just order mine Kontrol S2 but the thing I realise is this. I have some nice speaker for mine laptop but the connection is only a single cable that plug in through the headphone input to mine laptop. Speakers is a sub and 2 other mid and high range speakers that are all joined, they have no RCA input options. So I want to use the Kontrol S2's sound card but I guess this is not an option unless I get some monitor speakers?
If that is so, then is it possible to just use the S2 with mine laptop soundcard and have mine speakers plugged in through the headphone input on mine laptop?

I fear mine explinantion is terrible for you guys to understanding..
If anyone else is Japanese here I can explain mine problem better, if not then thank you very much in advance for any advice you give me...

P.s. I am planning on get monitor speakers soon so this will only be temporary.