Kind Code: A1 The present invention provides means for grasping whether or not content including sound is reproduced in a state where sound can be heard on the receiving side. A playback status investigation system for analyzing the playback status of content including audio, including playback software volume when the content is played back on the playback device, and an identifier for identifying the playback device A playback software volume acquisition unit that acquires software volume history information, manages the playback software volume history information for each content, and determines whether the playback software volume is equal to or higher than a predetermined value based on the playback software volume included in each history information. A content reproduction status judging unit for judging. [Selection] Figure 3
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