An electronic dictionary includes a central processing unit which performs retrieval of a first language information and then stores the first language information in a history area. When the first language information and the corresponding second language information are selected and displayed on a display device and the first language information is retrieved, the first language information can be registered in a word memo area by specifying the information read out from history area while taking advantage of a history function, whereby an operator can store desired language information in a memory device without reducing the efficiency of retrieval operations.