Abstract: A terminal device (10) including a touch panel (155) is configured to be able to communicate with an electrical treatment device (20) including a plurality of electrodes to be brought into contact with a site of the body of a user. The terminal device (10) includes a display control unit (407) configured to display a predetermined image on a display screen of the touch panel (155), a selection unit (403) configured to select a set of electrodes constituted of two electrodes among the plurality of electrodes in response to a touch operation performed on the predetermined image displayed on the display screen, and an instruction unit (405) configured to instruct the electrical treatment device (20) to apply a pulse voltage to the selected set of electrodes.