A BD-ROM stores a disc root certificate 301 that is issued by a root certificate authority and assigned to the disc medium. An application manger 2 acquires a hash value from the disc root certificate 301 and verifies the authenticity of an application by using the hash value. If the authenticity is verified, the virtual machine 3 executes the application. A local storage 5 has a plurality of domain areas. Form among the plurality of domain areas, a security manger 4 allocates to the application a domain area that corresponds to the hash value.