6. The electronic dictionary device of claim 5 , wherein the electronic dictionary device is configured such that a first case associated with the first display screen and a keyboard and a second case associated with the second display screen are coupled with each other so as to be openable and closable.
5. The electronic dictionary device of claim 4 , wherein the dictionary data comprises German-language dictionary data that stores entry words for German, and the common word is a prescriptive word of a compound word.