| 摘要 |
To enable to control an audio sound to a suitable volume level corresponding to the using condition of electronic equipment. In a portable disk device 2 that can be attached to a cradle 3 , a connection detecting line DET connected to a control part 50 for detecting an attached state or an unattached state to the cradle and a pullup resistance 56 , the control part 50 for controlling to set, if it is detected that the portable disk device 2 is in the unattached state, an audio sound to be emitted from the above portable disk device 2 to dedicated headphones 15 to a volume level based on a predetermined headphone volume value VH, and to switch, if being in the attached state is detected, an audio sound to be emitted from speakers 4 L and 4 R via the above cradle 3 from the volume level based on the headphone volume value VH to a volume level based on a line volume value VL larger than the above headphone volume value VH, and a DSP 53 are provided.
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