Disclosed are a thermotherapeutic apparatus having a function of measuring a heart rate and a method of controlling the same. The thermotherapeutic apparatus includes a pretreatment portion which extracts a ballistocardiogram signal sensed by a weight detecting sensor, a heartbeat signal extractor which extracts a heartbeat signal from the pretreated signal, and a mode performer which performs control to calculate a heart rate on the basis of the extracted heartbeat signal, to determine a massage mode according to the calculated heart rate, and to automatically set a massage pattern, a massage level, and a massage temperature of the corresponding massage mode so as to perform the corresponding massage mode.