A touch-sensitive electronic device comprising: a sensor part having a plurality of detection points and being configured to detect a capacitance that varies according to a touch or a proximity of an operation body on or to an operation surface ; a memory part that stores a reference value used as a basis of calculation of an amount of change in the capacitance and a threshold value (Th1, Th2, Th3) used for detection of the touch or the proximity; a determination part configured to compare the amount of change in the capacitance calculated based on the reference value with the threshold value (Th1, Th2, Th3) and to determine a state of the touch or the proximity with respect to the operation surface ; and a controller having a first sensing mode for the proximity sensing operation of the sensor part in which the plurality of detection points are grouped into multiple blocks and a change in the capacitance is detected for each block, and a second sensing mode for the touch sensing operation for the sensor part in which the change in the capacitance is detected for each of the detection points ; wherein the controller is configured to suspend the touch sensing operation in the sensor part during a period when the proximity of the operation body to the operation surface is not detected by the determination part , and characterized in that the controller is further configured to suspend the proximity sensing operation in the sensor part during a period when the touch of the operation body on the operation surface is detected by the determination part , and to allow the touch sensing operation and the proximity sensing operation to be performed alternately in the sensor part during a period when the proximity of the operation body to the operation surface is detected by the determination part . a sensor part having a plurality of detection points and being configured to detect a capacitance that varies according to a touch or a proximity of an operation body on or to an operation surface ; a memory part that stores a reference value used as a basis of calculation of an amount of change in the capacitance and a threshold value (Th1, Th2, Th3) used for detection of the touch or the proximity; a determination part configured to compare the amount of change in the capacitance calculated based on the reference value with the threshold value (Th1, Th2, Th3) and to determine a state of the touch or the proximity with respect to the operation surface ; and a controller having a first sensing mode for the proximity sensing operation of the sensor part in which the plurality of detection points are grouped into multiple blocks and a change in the capacitance is detected for each block, and a second sensing mode for the touch sensing operation for the sensor part in which the change in the capacitance is detected for each of the detection points ; wherein the controller is configured to suspend the touch sensing operation in the sensor part during a period when the proximity of the operation body to the operation surface is not detected by the determination part , and characterized in that the controller is further configured to suspend the proximity sensing operation in the sensor part during a period when the touch of the operation body on the operation surface is detected by the determination part , and to allow the touch sensing operation and the proximity sensing operation to be performed alternately in the sensor part during a period when the proximity of the operation body to the operation surface is detected by the determination part . <EOS>