An acquisition method includes: acquiring a first image without a flicker band; acquiring a second image with the flicker band; generating a third image of an extracted flicker band based; determining a division method of dividing the third image; dividing the third image into a plurality of areas based on the division method; calculating brightness of each area of the third image; acquiring at least one of a brightest value of the brightness and a darkest value of the brightness; acquiring peak timing of the flicker; calculating the number of frames captured by an image sensor to detect the peak timing; causing the image sensor to continuously capture images to generate a plurality of pieces of image data; acquiring the first image from the plurality of pieces of image data; and acquiring the second image from the plurality of pieces of image data.