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.