A receiver apparatus, comprising: a broadcast receiver configured to receive one of a plurality of first images as a broadcast stream via broadcasting, wherein the plurality of first images comprises a first time reference value of a clock reference, the plurality of first images being to be synchronized and reproduced; a communication receiver configured to receive a plurality of second images as a communication stream via the Internet, wherein the plurality of second images comprises a second time reference value of said clock reference; a criterion time generator configured to generate criterion time based on the first time reference value, the criterion time being used to generate timing to present the plurality of first images and the plurality of second images; an adjuster configured to adjust the criterion time based on an amount of delay of the second time reference value behind the criterion time, wherein the adjuster is configured to adjust the criterion time based on the amount of delay of the second time reference value received via the Internet by the communication receiver for the first time; a broadcast-receiver image decoder configured to decode, after the criterion time is adjusted, the broadcast stream received by the broadcast receiver such that the timing of the presentation of the broadcast stream is controlled based on the adjusted criterion time; a communication-receiver image decoder configured to decode, after the criterion time is adjusted, the communication stream received by the communication receiver such that the timing of the presentation of the communication stream is controlled based on the adjusted criterion time; and an image merger configured to merge a plurality of images decoded by the broadcast-receiver image decoder and the communication-receiver image decoder, wherein a first image includes low-resolution components of a high - resolution image and second images include the remaining high-frequency components of the high-resolution image. a broadcast receiver configured to receive one of a plurality of first images as a broadcast stream via broadcasting, wherein the plurality of first images comprises a first time reference value of a clock reference, the plurality of first images being to be synchronized and reproduced; a communication receiver configured to receive a plurality of second images as a communication stream via the Internet, wherein the plurality of second images comprises a second time reference value of said clock reference; a criterion time generator configured to generate criterion time based on the first time reference value, the criterion time being used to generate timing to present the plurality of first images and the plurality of second images; an adjuster configured to adjust the criterion time based on an amount of delay of the second time reference value behind the criterion time, wherein the adjuster is configured to adjust the criterion time based on the amount of delay of the second time reference value received via the Internet by the communication receiver for the first time; a broadcast-receiver image decoder configured to decode, after the criterion time is adjusted, the broadcast stream received by the broadcast receiver such that the timing of the presentation of the broadcast stream is controlled based on the adjusted criterion time; a communication-receiver image decoder configured to decode, after the criterion time is adjusted, the communication stream received by the communication receiver such that the timing of the presentation of the communication stream is controlled based on the adjusted criterion time; and an image merger configured to merge a plurality of images decoded by the broadcast-receiver image decoder and the communication-receiver image decoder, wherein a first image includes low-resolution components of a high - resolution image and second images include the remaining high-frequency components of the high-resolution image. <EOS>