A wireless image transferring apparatus (100) includes a free-run transmitter (20) and a free-run receiver (70). The free-run transmitter (20) includes a marker appending unit (25) for appending a vertical synchronization marker to image data and a nondisplay period adjustment unit (26) for adjusting the length of nondisplay period of image data according to monitoring information supplied. The free-run receiver (70) includes a marker extraction unit (71) for extracting the vertical synchronization marker from the image data received and a marker position monitoring unit (72) for monitoring whether the position of a marker in the image data containing the vertical synchronization marker lies within a predetermined range or not and generating the monitoring information containing a synchronization adjustment amount used to expand or contract the nondisplay period of the image data such that the position of a marker lies within the predetermined range.
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