This has Japanese and English UI. If you want to switch them, uninstall once, change locale of your Android and install again, please.
JARTIC updated their web site on 2012/Oct/1st, and version 1.x of this app doesn't work.
That problem is solved version 2.x. Please update it.
此版本中的新功能：v 2.0.6 : 2012/Oct/8th Fixed local map of Ishikawa.