An electronic device includes a receiving unit, a searching unit, a storing unit, and a displaying unit. The receiving unit receives a search character string. The searching unit searches a dictionary database according to the received search character string. The storing unit stores headwords which are obtained by the searching unit in a memory as search history data. The displaying unit displays a search history graph based on the search history data. Marks are arranged in the search history graph. The marks show positions of headwords searched for in past times, within a range of headwords collected in the dictionary data.