An electronic device secures diversity of a user utterance with respect to a content name when a user searches a content through a display device by utilizing a voice.A method by an electronic device includes steps of receiving input of a user voice, acquiring a keyword related to a content included in the user voice, and acquiring at least one modified keyword based on the keyword, acquiring a plurality of search results corresponding to the keyword and the at least one modified keyword, comparing the keyword and the modified keyword with the plurality of search results and acquiring a content name corresponding to the keyword, and updating a database of content names based on the keyword, the modified keyword, and the final content name.