Information apparatus and controlling method thereof

An information processing apparatus, comprising:

• a display unit that displays an image;
• a radio communication unit that transmits and receives data with external apparatuses;
• a first information processing unit having a first telephone controlling unit that controls a telephone process using the radio communication unit and a first display requesting unit that makes the display unit display the image in response to a request from the first telephone controlling unit;
• a second information processing unit having a second telephone controlling unit and a second display requesting unit, the second telephone controlling unit controlling a telephone process using the radio communication unit, making the display unit display the image in response to a request from a control unit inside the second information processing unit including the second telephone controlling unit, and the second information processing unit being mutually operable in parallel with the first information processing unit;
• and
• a mode controlling unit that controls one of the first information processing unit and the second information processing unit and sets to a master mode,
• wherein when the mode controlling unit sets the first information processing unit to the master mode, the first telephone controlling unit, the first display requesting unit, and the display unit are activated, and the second information processing unit is set to a slave mode in which the radio communication unit is activated and other functions are inactivated, and
• when the mode controlling unit sets the second information processing unit to the master mode, the second display requesting unit, the second telephone controlling unit, and the radio communication unit are activated, and the first information processing unit is set to the slave mode in which the display unit is activated and other functions are inactivated.