This energy treatment system includes: a first power source; a second power source; an ultrasonic vibrator that generates ultrasonic vibrations with electric power from the first power source; a first holding piece that has an electrode to which electric power is supplied from the second power source, wherein the ultrasonic vibrations are transmitted to the first holding piece, and a current passes through the first holding piece due to electric power from the second power source; and a second holding piece that has an electrode to which electric power is supplied from the second power source and opens and closes with respect to the first holding piece. This system also includes: an electrical characteristic detection unit that detects electrical characteristics of the ultrasonic vibrator over time; an impedance detection unit that detects an impedance value between the electrodes; a determination unit that determines whether the detected electrical characteristics satisfy a predetermined condition and whether the detected impedance value exceeds a predetermined threshold; and an output control unit that performs a predetermined operation when the determination unit determines that the predetermined condition is satisfied and determines that the impedance value exceeds the predetermined threshold.L'invention concerne un système de traitement par énergie comprenant : une première source d'alimentation ; une seconde source d'alimentation ; un vibreur ultrasonore qui génère des vibrations ultrasonores au moyen d'une alimentation électrique provenant de la première source d'alimentation ; une première pièce de maintien qui comporte une électrode alimentée en électricité par la seconde source d'alimentation, les vibrations ultrasonores étant transmises à la première pièce de maintien, et un courant traversant la première pièce de maintien en raison d'une alimentation électrique provenant de la seconde source d'alimentation ; et une seconde pièce de maintien qui comporte