The present disclosure includes an input module, a memory in which a self-diagnostic application is stored, and a processor configured to execute the self-diagnostic application. Herein, upon execution of the self-diagnostic application, the processor extracts multiple queries corresponding to a body part selected by a user on the basis of the user's input signal to select any one of multiple body parts and generates a diagnosis result for the user on the basis of the user's answers to the multiple queries. Further, the diagnosis result corresponds to at least one of multiple diseases.