I wonder that my SOP should decribe my academic background or not.
Yes, it should, but remember your purpose in writing it. This is to tell them about your purpose, your grand plan and how the school fits into it.
I think you write very clearly and skillfully. this is very good -- and you seem sincere in your expression of interest. This last sentence of the first paragraph is a little complex, though, so maybe we can do this:
I realize after gaining some experience in the field that, in order to fulfill my
career ambition of becoming a software consultant,
I realize after gaining an experience in this area I need to pursue a higher study program in the field of information management, with the emphasis on business systems integration and consultancy.
I am excited for you! Consulting work provides a great way to live, and systems knowledge is an important thing these days.
Here are my thoughts about the generalizations, though:
I strongly believe that knowledge and global perspective on information technology I would gain from XXXX's course would be a great indicator of my success. The program will absolutely sharpen my knowledge in the field and allow me to become----all of this is fluff. It does not really say anything. You should replace the fluff with sentences that indicate specific experiences available through the school's program and specific areas you want to master in order to be the professional you want to be. Name specific parts of your well-developed plan.
EXAMPLE: Rather than referring generally to a global perspective, discuss classes you will take about international diversification and cultural barriers, etc.
It's hard for me to give good examples, because I know so little about systems and software. :-)