The CEO of DeNA Co., whose health care information website and others have been under fire following accusations of plagiarism and inaccurate reporting, apologized Wednesday over the scandal, vowing to investigate what went wrong.

"We'd like to sincerely apologize to all concerned parties and individuals for causing troubles and worries," Isao Moriyasu, who is also the president of the company, said at a news conference in Tokyo.

"Regardless of forms of media, providing accurate information needs to be the first priority when operating a media business," he said. "Our operation focused too much on growing the services."