A sport guiding device and a sport guiding method using the same are provided. The sport guiding method includes the following steps. Two of a predetermined sport frequency intensity, a predetermined calorific capacity and a predetermined sport time are provided. A predetermined sport frequency curve is obtained according to two of the predetermined sport frequency intensity, the predetermined calorific capacity and the predetermined sport time. An actual sport frequency curve of a user is detected. If the actual sport frequency curve is deviated from the predetermined sport frequency curve for the predetermined level, then a tempo guiding signal is outputted.