1. A content data delivery system configured to be able to deliver various data to a handheld device and to make a content data available in said handheld device, said handheld device being configured to be connectable to a storage media that holds a unique media identifier and holds a content key data used to decrypt an encrypted content data, said content data delivery system comprising: a member-registration information database that holds member-registration information including a data pair of a handheld-device identifier related to said handheld device and said media identifier; a verification portion that reads said media identifier held by the storage media and verifies said media identifier with said member-registration information database; a storage condition determination portion that, when said verification portion determines that said media identifier corresponds to said member-registration information, reads said content key data held in the storage media, and determines whether an encrypted content data corresponding to the read content key data is stored in said storage media or other storage media coupled to said storage media; a display portion that displays a determination result of said storage condition determination portion; and a transfer portion that transfers said encrypted content data to said storage media or said other storage media depending on user's specification of said storage media.