Patent ID: 8554181

Claim:
A data communication system, comprising: an in-vehicle equipment for installation in a vehicle; a portable communication terminal configured to communicate with the in-vehicle equipment; and a server apparatus configured to communicate with the portable communication terminal, wherein the portable communication terminal includes: a request unit that transmits a request signal requesting voice data representing an email message, to the server apparatus when the portable communication terminal receives an email that has been sent to the portable communication terminal; and a transmission unit that transmits the voice data received from the server apparatus, to the in-vehicle equipment, the server apparatus includes: a converter that converts the email message sent to the portable communication terminal, into the voice data in response to the request signal received from the portable communication terminal; and a return unit that returns the voice data to the portable communication terminal, and the in-vehicle equipment includes: a voice output unit that outputs a voice message converted from the voice data received from the portable communication terminal, inside a cabin of the vehicle; a detector that detects a position of the portable communication terminal in the cabin; and a permission unit that permits outputting of the voice message converted only from the voice data representing the email message received by the portable communication terminal located in a specific position in the cabin.