A server, comprising: a communicator configured to perform communication through a network; a storage configured to store data on at least one predetermined word; and a controller configured to: upon receiving (S401, S602) an input signal, including data on speech, from a first electronic device through the communicator, perform (S402, S603) speech recognition of speech included in the input signal, and determine whether a last word of the speech corresponds to any one of the at least one predetermined word, characterized in that the controller is further configured to: in response to there being a word corresponding to the last word of the speech among the at least one predetermined word, transmit (S406, S609) a first response signal, including data on a response to the speech except for the last word and data including at least one query for inducing input of additional speech different from the speech, to the first electronic device through the communicator, and in response to there being no word corresponding to the last word of the speech among the at least one predetermined word, transmit a second response signal, including the data on the response to the speech, to the first electronic device through the communicator, wherein the data on the response to the speech includes information (710, 821, 823) corresponding to an answer to the speech. a communicator configured to perform communication through a network; a storage configured to store data on at least one predetermined word; and a controller configured to: upon receiving (S401, S602) an input signal, including data on speech, from a first electronic device through the communicator, perform (S402, S603) speech recognition of speech included in the input signal, and determine whether a last word of the speech corresponds to any one of the at least one predetermined word, characterized in that the controller is further configured to: in response to there being a word corresponding to the last word of the speech among the at least one predetermined word, transmit (S406, S609) a first response signal, including data on a response to the speech except for the last word and data including at least one query for inducing input of additional speech different from the speech, to the first electronic device through the communicator, and in response to there being no word corresponding to the last word of the speech among the at least one predetermined word, transmit a second response signal, including the data on the response to the speech, to the first electronic device through the communicator, wherein the data on the response to the speech includes information (710, 821, 823) corresponding to an answer to the speech. upon receiving (S401, S602) an input signal, including data on speech, from a first electronic device through the communicator, perform (S402, S603) speech recognition of speech included in the input signal, and determine whether a last word of the speech corresponds to any one of the at least one predetermined word, characterized in that the controller is further configured to: in response to there being a word corresponding to the last word of the speech among the at least one predetermined word, transmit (S406, S609) a first response signal, including data on a response to the speech except for the last word and data including at least one query for inducing input of additional speech different from the speech, to the first electronic device through the communicator, and in response to there being no word corresponding to the last word of the speech among the at least one predetermined word, transmit a second response signal, including the data on the response to the speech, to the first electronic device through the communicator, wherein the data on the response to the speech includes information (710, 821, 823) corresponding to an answer to the speech. in response to there being a word corresponding to the last word of the speech among the at least one predetermined word, transmit (S406, S609) a first response signal, including data on a response to the speech except for the last word and data including at least one query for inducing input of additional speech different from the speech, to the first electronic device through the communicator, and in response to there being no word corresponding to the last word of the speech among the at least one predetermined word, transmit a second response signal, including the data on the response to the speech, to the first electronic device through the communicator, wherein the data on the response to the speech includes information (710, 821, 823) corresponding to an answer to the speech.