The invention relates to an apparatus and method for data transmitting/receiving between a microwave oven and an information appliance PDA. The apparatus includes a wireless data transmitting/receiving unit for conducting wireless data communication with an external system including an information appliance; a data storage unit for storing transmitted/received data through the wireless data transmitting/receiving unit and/or downloaded data from Internet; a display unit for displaying transmitted data from the wireless data transmitting/receiving unit; a load drive unit for driving a magnetron and/or a heater; and Micom interfaced with the above elements, and interpreting the transmitted data from the wireless data transmitting/receiving unit and/or checking a state of the microwave oven, and controlling the wireless data transmitting/receiving unit to transmit the data on the state of the microwave oven to an information appliance. According to the invention, although the microwave oven does not include built-in networked communication equipment like a modem, it can interface with Internet through an information appliance, a PDA for example, which download data and transmits to the microwave oven. Thus, increase in price of the microwave oven with the modem is minimized and user interface is provided. Also, repair cost of the microwave oven can be minimized by checking the microwave based on the data on the internal state of the microwave being transmitted to the PDA.