Patent ID: 7619634

Claim:
An image display apparatus comprising: a first image data generating unit operable to generate and output first image data; a second image data generating unit operable to generate second image data and notify a request for a transfer of the generated second image data by outputting the second image data; an image display unit operable to generate a composite image from the first image data and the second image data and display the generated composite image; and a transfer arbitration unit operable to receive data pieces of the first image data one by one from the first image data generating unit and transfer the received data pieces of the first image data one by one to the image display unit, operable to receive and transfer the second image data to the image display unit during a period in which any data piece of the first image data is not transferred to the image display unit, and operable to, when receiving the request for the transfer of the second image data during a period in which a data piece of the first image data is transferred to the image display unit, output a wait signal to notify the second image data generation unit of an instruction to suspend the transfer of the second image data, wherein the transfer arbitration unit includes a sub-unit operable to notify the second image data generating unit of transfer frequency information that indicates a frequency with which the data pieces of the first image data are transferred, and the second image data generating unit includes a sub-unit operable to notify the transfer arbitration unit of a request for a transfer of the generated second image data, based on the transfer frequency information notified by the transfer arbitration unit.