上場企業名辞書2020年版 is a free Android-based application developed by JustSystems Corporation, a reputable name in the tech industry. This app is a dictionary of the latest listed companies' names. It includes popular companies such as Mitsubishi Corporation, Nippon Telegraph and Telephone, ITOCHU Corporation, ENEOS Holdings, Marubeni, and Toyota Tsusho.

This app works seamlessly with ATOK, making typing easier. ATOK Extended Dictionary adds words that can be converted, and the number of extended dictionaries that can be used in ATOK itself is ten. The app cannot be used with pre-installed ATOK and ATOK for Android [Professional], and the extended dictionary alone does not work.

To use the ATOK extended dictionary, go to ATOK settings, select ATOK extended dictionary or ATOK cloud service, and then select add from the list. To stop using the dictionary, long-tap (hold) the dictionary name in the list and select delete from the menu that opens.

The app has a comprehensive online manual and a frequently asked questions section for users' convenience. To use this app, your Android device must be compatible with the operating environment.