According to an embodiment, an electronic device comprises a communication module, a memory, and a processor configured to, upon obtaining a first utterance related to a memory service, prepare to store first information for the memory service for the first utterance and store the first information including essential information, sensitivity information for the first information, and an authentication method for the first information, detected from the first utterance, in the memory, and obtain a second utterance for looking up information related to the memory service, upon identifying that the obtained second utterance is one for looking up the first information, complete authentication based on the authentication method, and provide the essential information by a providing method determined based on the sensitivity information. Various other embodiments may be provided.