1. A subscriber unit for use with a program guide selection system in which program guide information, which includes operating characteristics of a communication system and selection codes which are associated with the operating characteristics of the communication system, is communicated over a communication network and displayed on a display viewed by a subscriber, the subscriber unit comprising: a receiver for receiving the program guide information and the selection codes associated with the operating characteristics; a microphone employed by the subscriber, when the subscriber identifies on the display at least one of the selection codes which is associated with at least a requested one of the operating characteristics, to orally input a voice expression which includes said at least one of the selection codes; and a speech recognition unit coupled to the microphone and operative to enable selection of said at least a requested one of the operating characteristics in response to said voice expression.