The present invention allows a reproducing device that can be used in various device environmental conditions to execute adequate output operation according to a device environmental condition. When reproducing a content signal of audio and video, a reproducing device determines a device environmental condition as the coupling state of the reproducing device and surroundings of the reproducing device. Subsequently, the reproducing device implements control according to output part information and control information that are set with being associated with the device environmental condition. Based on the output part information, either or both of a main-body output unit and an external output unit are controlled as a part for outputting audio or video. In addition, control corresponding to the registered control information is executed inside the device, or details of the control are indicated to a coupled external device.