A performance processing apparatus is operable by an operation device and equipped with a sound device and a display device. In the apparatus, a storing section stores song data representative of a music sound constituting a music song, and stores image data representative of an image. An acquiring section acquires detection information from the operation device, which is used by a user and which has a detector for detecting a chronological action or state of the user and outputting the detection information representative of the detected chronological action or state. A sound control section generates the music sound through the sound device according to the song data, and controls a progression degree of the generation of the music sound according to the acquired detection information. A display control section displays the image by the display device according to the image data in correspondence with the progression degree of the generating of the music sound. The display control section further controls a rendering mode of the image in accordance with the detection information.