Hi, Kouichi Kimura.
I see that you're trying to determine how much iCloud Storage you have available, but it's not showing the information. You're using cellular data, but it's not connecting. I'm happy to help.
Check the cellular data usage on your iPhone and iPad -- Tap Settings > Cellular, scroll down to the "Settings" application and turn cellular on. See if you're able to view your iCloud storage afterwards.
Let me know how that goes.
Take care!