AV system including amplifier and content reproducing device with connection-based on screen display

An amplifier capable of connecting to a reproducing device and a display, said amplifier comprising:

• a receiver receiving an external request for an On Screen Display;
• a determiner determining a type of connection among said amplifier, said content reproducing device, and said display when said receiver receives the external request for the On Screen Display;
• and
• a requester transmitting an On Screen Display request for displaying settings for said amplifier at said display to said content reproducing device when said determiner determines that said amplifier is connected to said display through said content reproducing device.

A content reproducing device capable of connecting to a display and an amplifier transmitting an On Screen Display request including setting information for said amplifier, said content reproducing device comprising:

• a receiver receiving the On Screen Display request from said amplifier;
• a producer producing a video signal or still-picture signal;
• a reproducing determiner determining whether said producer has produced the video signal or still-picture signal upon receiving the On Screen Display request;
• an On Screen Display producer producing an On Screen Display signal based on the setting information when said producing determiner determines that said producer has produced the video signal or still-picture signal;
• and
• a combiner outputting a composite signal produced by combining the On Screen Display signal and the video signal or still-picture signal to said display.

A computer program stored on a computer-readable medium causing a computer in an amplifier capable of connecting to a content reproducing device and a display, to perform the steps of:

• determining whether an external request for an On Screen Display has been received;
• determining a type of connection among said amplifier, said content reproducing device, and said display upon determining that the external request has been received;
• and
• transmitting an On Screen Display request for displaying settings for said amplifier at said display to said content reproducing device upon determining that said amplifier is connected to said display through said content reproducing device.