A content data managing apparatus includes: timing means for measuring time, not allowed to correct measure time by an operator; content-data storing means for storing data of content and recording time of the content measured by the timing means; content recording means for recording the content to cause the content-data storing means to store data of the recorded content; recording-time recording means for causing the content-data storing means to store, in association with the content, the recording time when the recording of the content is executed; storage-period extracting means for extracting data concerning a storage period for the content, from the data of the content; storage-period-end-time calculating means for calculating storage period end time for the content from the storage period and data of the recording time; and content-data deleting means for deleting the content when present time measured by the timing means is past the storage period end time.