To provide a disk reproducing device capable of instantaneously outputting video/sound of a changed disk by seamlessly changing disks whenever and at whatever timing a changing request is received about a disk to be reproduced from among a plurality of disks.

A plurality of buffer memories respectively corresponding to a plurality of disks are provided, each buffer memory stores data to be reproduced next and a data end address about each of the disks, and data stored in corresponding buffer memories is sequentially reproduced when a request for changing disks to be reproduced is received. Whenever and at whatever timing the request for changing disks is received, disk changing is seamlessly performed so that video/sound of a changed disk can instantaneously be outputted.