Thank you very much for all your info! It will really help me a lot!

I was able to reclaim the space by using dbcc updateusage()....

Thanks to all!

No... I did not perform any deletion in our data... The situation is this. I executed sp_spaceused table_name and below is the result.

tablename      rows         reserved      data          index_size    unused 

table_name    3708631     3032360...