Hasan,

Check this link..

http://www.ignou.ac.in/schools/soss/Into.html

http://onlineadmission.ignou.ac.in/programme.pdf..

In this link eligibility criteria is mentioned.. and fees..

Use this link to download the prospectus..
http://onlineadmission.ignou.ac.in/Prospectus.pdf

And this link to apply for the course online..

http://onlineadmission.ignou.ac.in/Apply.htm

Cheers and good luck.