Wireless communication system, data transmitter and wireless communication method

A data transmitter, having an image pickup device, for performing interactive wireless data communications with each of a plurality of data receivers, the data transmitter comprising:

• a display for displaying an image of a data receiver photographed by the image pickup device, from among the plurality of data receivers;
• a data transmission destination recognizer for recognizing, as a transmission destination of transmission data, the data receiver with the image thereof displayed on the display;
• a directional antenna controller for directing a directional antenna to the data receiver recognized as the transmission destination of the transmission data by the data transmission destination recognizer;
• a command transmitter for transmitting a communication designation command to the data receiver to which the directional antenna is directed by the directional antenna controller;
• an ACK receiver receiving an ACK packet, containing a device address of the data receiver, from the data receiver to which the communication designation command has been transmitted by the command transmitter;
• a device address storage for storing the device address of the data receiver received by the ACK receiver;
• a non-directional antenna;
• a transmission destination designation mode setter for setting a transmission destination designation mode in response to an input by a user;
• and
• an antenna switch for switching from the non-directional antenna to the directional antenna when the transmission destination designation mode is set by the transmission destination designation mode setter, wherein the antenna switch switches from the directional antenna to the non-directional antenna after the device address storage stores the device address of the data receiver.

A method of performing interactive wireless data communications between a data transmitter, having an image pickup device, and a plurality of data receivers, the method comprising steps of:

• displaying an image of a data receiver photographed by the image pickup device, from among the plurality of data receivers;
• recognizing, as a transmission destination of transmission data, the data receiver based on the displayed;
• directing a directional antenna to the data receiver recognized as the transmission destination of the transmission data;
• transmitting a communication designation command to the data receiver to which the directional antenna is directed;
• receiving an ACK packet, containing a device address of the data receiver, from the data receiver to which the communication designation command has been transmitted;
• storing the received device address;
• setting a transmission destination designation mode in response to an input by a user:
• and switching from a non-directional antenna to the directional antenna when the transmission destination designation mode is set, wherein the switch from the non-directional antenna to the direction antenna occurs after the received device address is stored.