To adjust the image quality and the sound quality collectively.

This adjustment device is provided with a plurality of image quality adjustment circuits 3 adjusting contrast and luminance or the like, a sound quality adjustment circuit 4 adjusting a bass and treble, a storage device 13 storing sound quality digital data in response to a sound quality control signal and image quality digital data in response to an image quality control signal, an image quality/sound quality operation key 5 used to read out the image quality digital data, and a D/A converter circuit 11 converting the image quality/sound quality read out by this operation into analog data to outputs a control signal to each adjustment circuit. Then one set of image quality digital data and one set of sound quality digital data are read altogether and the image quality adjustment circuits 3 adjust the image quality into any of a plurality of desired image quality sets and the sound quality adjustment circuit 4 adjusts the sound quality to any of a plurality of desired sound quality sets.