1. A pose classification apparatus comprising: a first image analyzer and a second image analyzer which are configured to estimate a body part for each pixel of an input image including a human body; a body part decider configured to calculate reliabilities of analysis results of the first image analyzer and the second image analyzer, and configured to decide the body part for each pixel of the input image based on the calculated reliabilities; and a pose estimator configured to estimate a pose of the human body included in the input image based on the decided body part for each pixel, wherein the first image analyzer and the second image analyzer each learn based on different data.