A terminal device, a control method, a treatment system, and a non-transitory computer-readable medium, with the terminal device being configured to wirelessly communicate with an electrical treatment device. A terminal device is configured to wirelessly communicate with electrical treatment devices. Each one of the electrical treatment devices comprises a case and a vibration source that vibrates the case. The terminal device comprises a display control unit that displays image information associated with the each one of the electrical treatment devices on a display of the terminal device; a vibration instruction unit that instructs one of the electrical treatment devices associated with image information selected by a user to vibrate the case; and a treatment content setting unit that sets a treatment content performed by the each one of the electrical treatment devices in accordance with an instruction from the user notified by vibration of the case.