A receiver apparatus, comprising: a broadcast receiver configured to receive a first image stream by broadcasting, wherein the first image stream comprises presentation time information, said presentation time information including a first time code being included in each first unit of first image data of the first image stream; a communication receiver configured to receive a second image stream via the Internet, a second time code being included in at least each first unit of second image data of the second image stream, the second image data being to be synchronized with the first image data and reproduced; a criterion time generator configured to generate criterion time, the criterion time being used to generate timing to execute a process of presenting the first image data; a first image decoder configured to decode the first image stream received by the broadcast receiver; a second image decoder configured to decode the second image stream received by the communication receiver; a time code processor configured to obtain, at determined timing, the first time code included in the received first image stream and the second time code included in the second image stream,; and characterised in that the receiver apparatus comprises, an adjuster configured to adjust the criterion time with reference to an amount of delay of the second time code behind the first time code, wherein the first image decoder is configured to decode, after the criterion time is adjusted, the first image stream such that the first image stream is to be presented at the timing when the presentation time information coincides with the criterion time, the time code processor is configured to obtain, after the criterion time is adjusted, the first time code included in each first unit of the first image data of the first image stream to be decoded by the first image decoder, and to supply the first time code to the second image decoder, and the second image decoder is configured to decode, after the criterion time is adjusted, the first unit of the second image data of the second image stream having the second time code which is the same as the supplied first time code being included in the first unit of the first image data of the first image stream. a broadcast receiver configured to receive a first image stream by broadcasting, wherein the first image stream comprises presentation time information, said presentation time information including a first time code being included in each first unit of first image data of the first image stream; a communication receiver configured to receive a second image stream via the Internet, a second time code being included in at least each first unit of second image data of the second image stream, the second image data being to be synchronized with the first image data and reproduced; a criterion time generator configured to generate criterion time, the criterion time being used to generate timing to execute a process of presenting the first image data; a first image decoder configured to decode the first image stream received by the broadcast receiver; a second image decoder configured to decode the second image stream received by the communication receiver; a time code processor configured to obtain, at determined timing, the first time code included in the received first image stream and the second time code included in the second image stream,; and characterised in that the receiver apparatus comprises, an adjuster configured to adjust the criterion time with reference to an amount of delay of the second time code behind the first time code, wherein the first image decoder is configured to decode, after the criterion time is adjusted, the first image stream such that the first image stream is to be presented at the timing when the presentation time information coincides with the criterion time, the time code processor is configured to obtain, after the criterion time is adjusted, the first time code included in each first unit of the first image data of the first image stream to be decoded by the first image decoder, and to supply the first time code to the second image decoder, and the second image decoder is configured to decode, after the criterion time is adjusted, the first unit of the second image data of the second image stream having the second time code which is the same as the supplied first time code being included in the first unit of the first image data of the first image stream.