An information processing device comprising: a data processing unit configured to load a disk, which stores content that is divided into content usage control units, and to execute processes for reading the content; and a local storage unit configured to store subsequential data obtained and/or generated subsequentially, wherein the data processing unit is configured to perform processes to: select a title that is an index for reading the subsequential data from dummy titles stored in advance on the disk; set the title as a title for the subsequential data; and store the subsequential data in the local storage unit.