According to an embodiment, an electronic device includes a user interface, a memory, and a processor. The memory is configured to store a main database including at least one input data or an auxiliary database including at least one category including pieces of response data. The processor is configured to receive a user input, using the user interface, and extract first information from the user input. The processor is also configured to identify whether a portion of the input data of the main database matches the first information. The processor is further configured to identify a category of the user input in response to identifying that the input data of the main database does not match the first information. Additionally, the processor is configured to identify the auxiliary database corresponding to the category, and provide first response data based on an event that the auxiliary database is identified.