In order to solve a conventional problem that an accurate translation cannot be realized, a learning apparatus includes: a parser unit parsing a target language sentence, thereby acquiring a binary tree of the target language sentence; a source language element acquiring unit acquiring one or more source language elements; a source language partial structure acquiring unit acquiring one or more source language partial structures each containing a parent node having a phrase label and two child nodes each having a phrase label or a source language element; a labeling unit providing a reordering label to the one or more source language partial structures; a model building unit that builds one or more parsing models each having appearance probability information regarding a labeled source language partial structure; and an accumulating unit accumulating a binary tree of a source language sentence having the one or more parsing models.