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; an image processing portion that executes processing on the image based on a result of the speech recognition performed by the speech recognition portion; an associated information storage portion that stores associated information pieces that are associated with the compound phrases; a function phrase storage portion that stores a function phrase that is related to a function that the image processing apparatus has; a user phrase writing portion that writes a user phrase designated by the user to the associated information storage portion; and a processor to control one or more of the portions; wherein the image processing portion extracts an associated information piece among the associated information pieces stored in the associated information storage portion based on the result of the speech recognition performed by the speech recognition portion, and executes processing on the image with use of the extracted associated information piece; and wherein the compound phrase generation portion generates the compound phrases with use of the function phrase and the user phrase.