1. An image processing apparatus provided with an image reading apparatus that reads an image of an original, the image processing apparatus comprising: a speech input portion that receives an input of speech from a user; a dictionary storage portion that stores a dictionary configured by phrase information pieces for recognizing the speech; a compound phrase generation portion that generates a plurality of compound phrases formed by all combinations of a plurality of predetermined phrases in different orders; a compound phrase registration portion that registers the plurality of compound phrases that have been generated in the dictionary as the phrase information pieces; a speech recognition portion that, in a case where speech including a speech phrase formed by the plurality of predetermined phrases said in an arbitrary order has been input, performs speech recognition on the speech by searching the dictionary for a compound phrase that matches the speech phrase; and an image processing portion that executes processing on the image based on a result of the speech recognition performed by the speech recognition portion.