Dentsu Inc. said Thursday that Executive Vice President Tadashi Ishii will become president on April 1, succeeding Tatsuyoshi Takashima.

The major advertising agency believes Takashima has led the company to bolster its overseas operations and overall earnings, and now is the time for the 67-year-old president to step aside so management can be rejuvenated, company officials said.

After joining the company in 1973, Ishii, 59, acquired experience in dealing with corporate advertisers. His major challenge as president will likely be to break a new path in the advertising industry to adapt to the realities of the increasingly diverse media world.

Takashima will become chairman without the right to represent the company.

Takashima became president in June 2007. Ishii got his current post in April 2009.