An interfacing device and method to support a speech dialogue service based on a multi-modal input are provided. The method includes executing an interface for the speech dialogue service, receiving a user input, through the executed interface, including a voice input and a non-voice input, transmitting, as a request signal to a server, at least one of the voice input or a text extracted from the voice input when the received user input is the voice input, transmitting, as the request signal to the server, a text extracted from the non-voice input when the received user input is the non-voice input, receiving a result of dialogue recognition in response to the request signal from the server, and executing a response to the received user input on the basis of the received result of dialogue recognition.