11. The electronic dictionary as set forth in claim 1, wherein said different vocabulary entries include a group-linking term which belongs to one of said plural groups and to another of said plural groups, said one group consisting of vocabulary entries which are synonymous with one of plural meanings of said group-linking terms, said another group consisting of vocabulary entries which are synonymous with another meaning of said group-linking term, said group-linking term serving as said linking vocabulary entry common to said one and another groups, said group-linking means linking said one and another groups at said group-linking term.
11. The electronic dictionary as set forth in claim 1, wherein said different vocabulary entries include a group-linking term which belongs to one of said plural groups and to another of said plural groups, said one group consisting of vocabulary entries which are synonymous with one of plural meanings of said group-linking terms, said another group consisting of vocabulary entries which are synonymous with another meaning of said group-linking term, said group-linking term serving as said linking vocabulary entry common to said one and another groups, said group-linking means linking said one and another groups at said group-linking term. 14. The electronic dictionary as set forth in claim 11, wherein said display means indicates, in addition to the vocabulary entry which has been retrieved by said retrieval means, a group-identification symbol which represents one of said one and another groups to which the indicated vocabulary entry belongs.