The Investis Quarterly Corporate Website Ranking, which measures the effectiveness of all FTSE 100 corporate websites, found the banking sector to be one of the poorest performers relative to its size.
The research found that little industry perspective is available through the banks' corporate sites. It noted their poor or slow responses to the current financial crisis.
The report also highlighted a lack of communication other than by press releases.
The mining sector performed worst, with four of the ten FTSE 100 firms in the bottom ten of the rankings.
Food retail was the best performing sector - with Sainsbury's coming in for praise for its web-focused annual review.
Insurance group Aviva topped the rankings, standing out for its optimisation of the site for BlackBerry users.
'A well managed website can make the difference between merely surviving and success,' said Elisabeth Lewis-Jones, president of the CIPR.