An electronic device and method are disclosed. The electronic device includes a communication interface, a microphone, a speaker, a processor and a memory. The processor executes the method, including receiving a first message through a communication interface from an external device, in response to receiving a first user input associated with the first message through an input interface including a microphone, converting first text included in the first message into speech, outputting the speech through an output interface of the electronic device including a speaker, determining whether to execute an additional operation associated with the first message, based on at least one of a state of the first electronic device, the first message, and a second user input received via the microphone, and initiate a conversational mode for executing the additional operation based at least partly on the determination.