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A source told The Sun newspaper: "The press conference in Japan got embarrassing because the boys' culture shock was so obvious.
"Over the weekend they vowed to learn at least 20 of the most common words in the languages of the countries they're visiting before they land there.
"They think it will avoid embarrassing moments and build up a bond with fans."
In order to make more of an effort during their worldwide tours in the future, the band have vowed to "brush up" on their skills and educate themselves by watching videos online.
The source added: "They're just going to use YouTube tutorials to brush up on their language skills and think that's going to be enough."
Before they visited Japan, the five British heartthrobs took a trip to Africa to help raise money for Comic Relief's Red Nose Day 2013.
After spending time in the poverty-stricken town of Accra, Ghana, the boys described it as an "amazing" experience.
Niall, 19, posted on his Twitter account: "Just arrived back from Accra, Ghana! Best experience ever! This @rednoseday please get involved!
"Massive thanks to @rednoseday for taking us to Ghana! It was incredible! real eye opener! We take so much for granted over here ! (sic)"