11. The method according to claim 9 , wherein the determining comprises: determining whether or not there exists a language to be translated based on languages used in the plurality of sentences and the at least one language to be hidden; in response to there being the language to be translated, automatically translating at least a part of the plurality of sentences into the language to be translated; and combining sentences to be hidden based on the plurality of sentences and the sentences created at the operation of performing automatic translating.
11. The method according to claim 9 , wherein the determining comprises: determining whether or not there exists a language to be translated based on languages used in the plurality of sentences and the at least one language to be hidden; in response to there being the language to be translated, automatically translating at least a part of the plurality of sentences into the language to be translated; and combining sentences to be hidden based on the plurality of sentences and the sentences created at the operation of performing automatic translating. 13. The method according to claim 11 , wherein the determining whether or not there exists a language to be translated comprises displaying the language to be translated to outside.