Japan and Lebanon do not have an extradition treaty and it is thought unlikely that Lebanon would agree to send Ghosn back to Japan to face trial.
Mori acknowledged that there were various environments and laws that underpin different positions on the issue in each country.
Ghosn was arrested in late 2018 and is facing charges of under-reporting income and breach of trust. He says he is innocent. He led Nissan for nearly 20 years.
Having spent months in detention and struggled to gain his release on bail under stringent conditions, Ghosn said he fled in the belief he could not get a fair trial in Japan.
Deputy justice minister, Hiroyuki Yoshiie, was to leave Japan for Lebanon on Saturday. He is expected to meet with the Lebanese justice minister on Monday.