Apple says it sold more than 450,000 iPads in the first few days after the device was available. Consumers were drawn to Apple’s cachet and the fresh approach to computing that the iPad represents, with its elevation of a touch screen and entertainment over a keyboard and productivity.

But commentators and consumers have also been talking about what the iPad lacks — for example, a camera and the ability to display much of the Web’s entertainment content, like videos, if presented in the Flash format. The iPad has also been criticized for its inability to allow users to multitask, but the company announced on Friday that it will have that ability in the fall. Another drawback to the iPad is that it relies on a cellphone chip, with less horsepower than a computer chip.

H.P.’s version of the iPad is expected to be released by midyear. Notably, it will have a camera, as well as ports for add-on devices, like a mouse. Also, it will, the company says in a promotional video, “run the complete Internet,” including videos and other entertainment.

Phil McKinney, the chief technology officer in H.P.’s personal systems group, said in a recent interview that the company had been working on its tablet for five years. It delayed releasing the product, he said, until the price could be lower.

The company’s marketing department has been trickling out online videos of the device. This kind of early marketing is a change for H.P., which rarely talks about yet-to-be released products. Mr. McKinney, however, said H.P. had felt little pressure from Apple’s early move and would release its slate when it was ready.

“I have one sitting on my desk,” Mr. McKinney said. “We don’t react or respond to competitive timing and those types of issues.”