Thanks for the replies.
By book app i mean, the software converts the file into an android app, which lets you read the contents of the file with some page flipping effects etc. By this there is no need to install another epub reader.
Well my problem is, it is not an one single word file, but a total of 54 word files. I tried converting one of the word file to epub but did not help as the resultant epub file just consisted of junk characters.
So i am back to square one now. Any help is much appreciated.
All you need to do is to merge those word files into 1. This article should help -> *support.microsoft.com/kb/2665750/en-us
Then go to *convertfileonline.com/ and upload your word file and convert it into pdf with full formatting.
Finally upload this pdf and convert it into epub. If you want to change the dimensions of the pdf there should be tools available for this. Use google.