1. An information processor, comprising: an analyzer configured to analyze image data to obtain a level of similarity between current image data, which is to be processed, and reference image data, to determine whether or not the current image data and the reference image data are similar to each other depending on whether or not the level of similarity reaches a predetermined threshold, and to store the current image data in a storage unit irrespective of whether the current image data is determined to be similar to the reference image data; an encoder configured to encode the current image data; a discarding section configured to discard encoded data generated from the current image data encoded by the encoder when the current image data is determined to be similar to the reference image data; and a transmitter configured to transmit the encoded data generated from the current image data encoded by the encoder when the current image data is determined not to be similar to the reference image data.