1. A mobile display apparatus serving as a client device of an external host apparatus, the mobile display apparatus comprising: a display section; a voice output section; a video signal input section arranged to receive an input video signal from the external host apparatus; a display control section arranged to display in the display section an image based on the input video signal; a text recognizing section arranged to (i) extract a text image from an image corresponding to the input video signal and (ii) convert the text image into a text code; and a voice output control section arranged to output voice sounds corresponding to the text code through the voice output section; wherein the video signal input section outputs the input video signal supplied from the external host apparatus to the display control section and the text recognizing section; the text recognizing section converts the text image extracted from the image corresponding to the input video signal supplied from the video signal input section into a text code, and outputs the text code to the voice output control section so that the image corresponding to the input video signal is displayed in the display section; and the voice sounds corresponding to the text code are outputted from the voice output section.
9. The mobile display apparatus as set forth in claim 1 , wherein: the display section includes an EL layer.