Provided is a method of providing, by an electronic device, information about a reason why a response has changed, the method including: outputting a first response by processing at least one module according to a first input; obtaining information about a history of a second response output according to a second input having a same intention as an intention of the first input, the second response being different from the first response; identifying, as a changed module, a module operated differently from at least one module operated according to the second input from among at least one module operated according to the first input, based on the obtained information; and providing information about the reason why the first response has changed from the second response based on the changed module.