PROBLEM TO BE SOLVED: To improve visibility and operability in a display mode causing a waveform and a cursor to be displayed.SOLUTION: Provided are: a touch sensor 22 that is arranged oppositely in a display area AO of a display part 13; and a processing part that causes a waveform W to be displayed in a first area A1 as a partial area in the display area A0, and causes a line cursor L1 for designating a clock time on a time axis Xt to be displayed in the first area A1 in accordance with a touch operation to the touch sensor 22. When a first operation, in which a fingertip 50 is touched to a second opposite area B2 opposing a second area A2 outside the area A1 and in the touch sensor 22 within the display area A0 and the fingertip 50 moves from the second opposite area B2 to a first opposite area B1 opposing the first area A1 and in the touch sensor 22 with the fingertip 50 put into the touch state, is performed, the processing part causes the line cursor L1 to be displayed in the first area A1 and causes th
