Apple lost its High Court appeal over a ruling that the rival Samsung Galaxy tablet did not copy the iPad.
The world's two leading smartphone makers are fighting over patents, both for smartphones and for tablets, in courts around the world.
The Court of Appeal upheld its judgment that despite some similarities, Samsung did not infringe Apple's design, in part because its products were "not as cool" as the iPad.
The U.S. company was instructed to run ads saying the Korean company did not copy the iPad, both on its website and in selected newspapers.
Judge Kitchin said that the notices must be in a font size no smaller than Arial 14.
More top news
After a frosty start, southeastern areas will be dry with increasing amounts of sunshine developing. It will remain cold throughout the day.
Higher food and petrol prices are expected to send inflation to its highest level in 28 months when official figures are released later.
The Prime Minister will detail her 12-point plan on negotiating Britain's exit from the European Union during a speech on Tuesday.