A method for providing a security function includes obtaining a request for executing a function of application through an electronic device if the electronic device is located within a predetermined distance from a user, identifying a success or failure of a first authentication which is previously performed for the user in response to the request, and determining whether to perform a second authentication for executing the function of the application based on the success or failure of the first authentication, wherein determining whether to perform the second authentication comprises performing the second authentication by using a security level lower than a security level related to the first authentication if the success of the first authentication is identified. An electronic device includes a processor configured to determine a success or failure of a first authentication, and decide whether to perform a second authentication with a second security level for executing the function.