Women in Japan should not hesitate to dream big and have the confidence to develop their careers in order to boost diversity in the workplace, panelists at Japan's largest annual conference for working women said.

"Women tend to focus on doing things they are skilled at, whereas men tend to look for challenges in their careers," said Fujiyo Ishiguro, a keynote speaker at the event and president and CEO of digital marketing firm Netyear Group Corp.

"Think about what you really want to do and move toward it, so you will be able to expand your possibilities and gain positions with more responsibilities," she said.