He was born in Tokyo, the eldest son of a doctor. Soon his family moved to China, and he grew up in Chin Tao and then in Beijing. When he reached school age, he returned to Japan and lived in Okazaki, his father's homeland. After that, he moved to Tokyo to attend one of the Keio University pending private middle school. Until 1955 he studied aesthetics and art history at Keio University.
He started to learn music composition through self-study. When he visited the middle school, he learned composition by Kishiro Hirao (平 尾 贵 四 男), Kofune Kojiro (小船 幸 次郎) and then Ryutaro Hirota (弘 田 龙 太郎). In the second year of his studies, he won the first prize in the composition competition of Asahi Shimbun. This success led him to make a composition for the profession. He worked during his studies as a composer.
Tomita is known for his reactions predominantly classic pieces on synthesizer. 1974 Isao Tomita has published piano pieces by Claude Debussy entitled Snowflakes are Dancing. In 1975, its probably best-known work Pictures at an Exhibition by Modest Mussorgsky originally composed for piano, a synthesizer version out. 1976 sat Tomita Gustav Holst's The Planets around. At the beginning he had it with a rocket launch countdown composed from Earth, in which dominates the theme of Jupiter. In the same year Tomita, alongside a selection of different classical works published on the disk cosmos, a synthesizer version of John Williams' theme for the film Star Wars, which ends with a small surprise and seamlessly with a fragment from Beethoven overlaps Für Elise. Also, the recorded soundtrack to the 1992 international TV production "Storm from the East " is not an original composition by Tomita. It is based on an ancient Mongolian folk song, which is varied over 15 tracks. Overall, Isao Tomita has released more than 13 albums. In 2011 he was honored for his work as a composer with the Asahi Prize.