An operation display device, comprising: a display unit; a touch panel configured to simultaneously detect a plurality of touch operations which are carried out with fingers to a display surface of the display unit; a finger shape detecting unit configured to detect a shape of a contact part of the finger, which contacts to the display surface in each of the touch operations, so as to obtain information relating to the shape of the contact part of the finger including the size of the contact area and the direction of the finger; and a control unit configured to control display contents of the display unit, wherein, when the plurality of touch operations carried out to the display surface are simultaneously detected by the touch panel, the control unit is configured to judge whether the plurality of touch operations are a multitouch operation carried out by one operator or are operations carried out by a plurality of operators and to change the display contents of the display unit in accordance with a result of judging the plurality of touch operations; wherein the judgement whether the operators who carry out touch operations relating to two simultaneous contact positions (31a, 31b) respectively are the same person or not is based on the information relating to shapes of the contact parts which contact to the contact positions (31a, 31b), which are detected by the finger shape detecting unit; wherein, when the control unit judges that the plurality of touch operations are the multitouch operation carried out by one operator, the control unit is configured to recognize that the plurality of touch operations are a set of operations, and to change the display contents in accordance with contents of the set of operations, characterized in that when the control unit judges that the plurality of touch operations are the operations carried out by the plurality of operators, the control unit is configured to divide the display surface into a plurality of areas corresponding to the number of the operators, and to instruct the display unit to display separate windows in the areas respectively, and the touch panel receives the operation independently in each of the separate windows; and wherein the control unit is further configured to change a division direction in which the display surface is divided into the plurality of areas, in accordance with a dispersion status of contact positions of the fingers relating to the plurality of touch operations in the display surface. a display unit; a touch panel configured to simultaneously detect a plurality of touch operations which are carried out with fingers to a display surface of the display unit; a finger shape detecting unit configured to detect a shape of a contact part of the finger, which contacts to the display surface in each of the touch operations, so as to obtain information relating to the shape of the contact part of the finger including the size of the contact area and the direction of the finger; and a control unit configured to control display contents of the display unit, wherein, when the plurality of touch operations carried out to the display surface are simultaneously detected by the touch panel, the control unit is configured to judge whether the plurality of touch operations are a multitouch operation carried out by one operator or are operations carried out by a plurality of operators and to change the display contents of the display unit in accordance with a result of judging the plurality of touch operations; wherein the judgement whether the operators who carry out touch operations relating to two simultaneous contact positions (31a, 31b) respectively are the same person or not is based on the information relating to shapes of the contact parts which contact to the contact positions (31a, 31b), which are detected by the finger shape detecting unit; wherein, when the control unit judges that the plurality of touch operations are the multitouch operation carried out by one operator, the control unit is configured to recognize that the plurality of touch operations are a set of operations, and to change the display contents in accordance with contents of the set of operations, characterized in that when the control unit judges that the plurality of touch operations are the operations carried out by the plurality of operators, the control unit is configured to divide the display surface into a plurality of areas corresponding to the number of the operators, and to instruct the display unit to display separate windows in the areas respectively, and the touch panel receives the operation independently in each of the separate windows; and wherein the control unit is further configured to change a division direction in which the display surface is divided into the plurality of areas, in accordance with a dispersion status of contact positions of the fingers relating to the plurality of touch operations in the display surface.