Abstract: A system and method, comprising providing a speech engine running on a computer system supporting an interface selected from the group consisting of one or more of a text-to-speech interface and a speech-to-text interface; presenting to a user through a user interface, an interactive advertisement, the interactive advertisement at least one of: presenting a speech output derived from a text file received from a server to a user; and receiving a speech input which is converted to text in dependence on a data file defining at least one of a vocabulary and a grammar, the speech input converted to text being communicated to an advertisement server.