"Several features of the overall process indicate that Google engages in misleading conduct."
Google was disappointed with the appeal court ruling and was reviewing its options, it said. It said the company was committed to providing an advertising platform that benefited both advertisers and users.
Google has changed the way results are displayed since 2007.
The Australian Competition and Consumer Commission sued Google, in the first claim of its kind in the world that makes the search-engine company responsible for the content of ads, according to the regulator.
Justice Antony Nicholas dismissed the ACCC complaint in September, ruling that Google didn't know publication of the ads amounted to a contravention of the Trade Practices Act.
The ACCC appealed, citing four advertisements, including those that showed up in a search for Australian company Harvey World Travel, that it said Google should have known would contravene the law.
- Bloomberg