analayzing a report in html format

i have to develop a program to analyze reports stored in html format. Is it the similar to analyze text document or are ther some other ways to analyze html format documents.

It depends on what you're looking for. Basically, HTML is pretty much like plain text. The difference is that there are tag codes that turn on/off special formatting etc. Possibly these tags may interfere with your analysis. If so, it's relatively easy to filter them out.

Give an example of what kind of analysis you want to do.

"I have a plan so cunning you could put a tail on it and call it a weasel!" - Edmund Blackadder

the report i will analyze is made up of 6 group(columns) and each column keeps some data about a customer.
two coulumns keep the previous and current names of the persons. if there is a change in the name of the person(previous and current names aren't the same) i will get other information about that person.

Yeah, you should be able to analyse this using your normal text methods. Open up the HTML file using a text editor like notepad and you'll see what I mean about HTML being like plain text with tags.

"I have a plan so cunning you could put a tail on it and call it a weasel!" - Edmund Blackadder