A method for generating feedback signal in a device includes steps of receiving user input, and setting resolution of the device and media types of the television signals according to the user input; tuning a channel according to the user input to receive channel signals; decoding the channel signals; counting a period; detecting whether the device receives television signals; detecting whether an interrupt instruction is received if the device does not receive the television signals; generating a feedback signal according to the interrupt instruction if the interrupt instruction is received, and transmitting the feedback signal to a media server if the interrupt instruction is received.