Electrical treatment device and treatment system

A treatment system, comprising:

• an electrical treatment device including a plurality of electrodes that come into contact with a site of a body of a user;
• and
• a terminal device including a terminal device processor capable of wireless communication with the electrical treatment device, wherein
• the terminal device receives an operation for adjusting an electrical stimulation intensity provided to the site and transmits a signal indicating the operation to the electrical treatment device;
• the electrical treatment device includes an electrical treatment device processor that applies a pulse voltage corresponding to the electrical stimulation intensity to the plurality of electrodes and performs treatment of the site by changing a frequency of the pulse voltage within a predetermined frequency range continuously or in a step-like manner;
• and
• when the operation is performed, the processor changes the pulse voltage to correspond to the electrical stimulation intensity based on the operation and changes the frequency of the pulse voltage to a predetermined frequency and changes the changed frequency of the pulse voltage from the predetermined frequency continuously or in a step-like manner,
• when the operation is received, calculate a difference frequency between a frequency of a pulse voltage just before the operation is received and the predetermined frequency,
• wherein if the difference frequency is less than a threshold, change the frequency of the pulse voltage to the predetermined frequency and change the frequency of the pulse voltage from the predetermined frequency continuously or in a step-like manner, and
• wherein if the difference frequency is equal to or greater than the threshold, the processor is configured to change the frequency of the pulse voltage just before by only a predetermined value to approach but not meet the predetermined frequency and adjust the changed frequency continuously or in a step-like manner to approach but not meet the predetermined frequency.