Provided is an image codec apparatus that allows a user to check his own-image properly while feeling a strong sense of presence. The image codec apparatus (100) includes cameras (Ca, Cb, and Cc) that generate taken-image data by shooting, monitors (Ma, Mb, and Mc) that display images, encoders (101, 102, and 103) that code taken-image data, decoders (121, 122, and 123) that decodes coded image data for generating decoded image data, and synthesizers (111, 112, and 113) that process the taken-image data generated by the cameras (Ca, Cb, and Cc) for generating processed image data and synthesizing a processed image represented by the processed image with the decoded image and output, to the monitors (Ma, Mb, and Mc), synthesized image data that represents synthesized image.