Mr Takahashi, who is a member of a campaign group supporting the Japanese language, highlighted words such as "toraburu" (trouble), "risuku" (risk) and "shisutemu" (system) in NHK's news and entertainment programs.

He accused NHK of irresponsibility by refusing to use native Japanese equivalents.

"With Japanese society increasingly Americanized, Takahashi believes that NHK, as Japan's national broadcaster, shouldn't go with the trend, but remain determined to prioritize the use of Japanese, which he thinks would go a long way toward protecting Japanese culture," Mr Miyata told the Japan Times on Wednesday.

Mr Takahashi filed his complaint on Tuesday with the Nagoya District Court in the central Chubu region of Japan, the newspaper said.

NHK said it would not comment until it had studied the legal documents.

Other examples of English words often used in Japanese include:

terebi (TV)

rajio (radio)

konpuraiansu (compliance)

koraboreeshon (collaboration)

dejitaru (digital)

taoru (towel)

Vocabulary is also borrowed from other foreign languages. The German "arbeit" becomes "arubaito" to mean work, and the Portuguese "pao" is used as "pan" for bread.

Japanese words used in the English language include "haiku", "origami" and "Bonsai".

Other commonly used "loanwords" are the German "kindergarten", "zeitgeist" and "blitz" as well as French terms such as "faux-pas", "decor" and "cafe".

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