To enable users to acquire their desired image data by each individual user at respective terminal devices.

When individual image data and music name data are transferred from the terminal devices 3, an image data synthesizing and delivering means 12 of a host device 1 selects the arbitrary basic image data and synthesizes this data with the individual person image data. The synthesized image data is delivered together with the accompaniment music data corresponding to the music name data to the terminal device 3 as a KARAOKE singing- alone information exclusively used by the user. The image data of the KARAOKE sing-along information partially includes the users' own individual image data personally captured by the users. The image data meeting the users' liking may be acquired by each of the respective terminal devices 3 and may be displayed as personal background images.