An electric bicycle having no chain, comprising: a power generator configured to generate a voltage by driving of a pedal ; a power generation current sensor configured to sense a power generation current generated in the power generator ; a battery configured to store the voltage generated by the power generator ; a battery voltage sensor configured to sense a battery voltage charged in the battery ; a motor mounted on at least one of a front wheel and a rear wheel and configured to provide a rotational force to a mounted wheel by power supplied from the battery ; a pedal speed sensor configured to sense a speed of the pedal ; a motor driver configured to drive the motor ; and an electronic control unit configured to drive the motor according to a pedal speed sensed by the pedal speed sensor and to control a current supplied to the motor being driven based on a pedal torque applied to the pedal , wherein the electronic control unit calculates a target wheel speed so as to follow a pedal speed sensed by the pedal speed sensor , to calculate a target motor current according to the calculated target wheel speed, to supply a current to the motor using the motor driver so as to reach the calculated target motor current, characterized in that the electronic control unit , or alternatively a pedal torque estimator of the electric bicycle, estimates the pedal torque applied to the pedal based on the pedal speed sensed by the pedal speed sensor , the battery voltage sensed by the battery voltage sensor , and the power generation current sensed by the power generation current sensor , and wherein the electronic control unit is further configured to change the calculated target wheel speed based on the estimated pedal torque applied to the pedal , to change the target motor current according to the changed target wheel speed, and to change the current supplied to the motor using the motor driver so as to reach the changed target motor current. a power generator configured to generate a voltage by driving of a pedal ; a power generation current sensor configured to sense a power generation current generated in the power generator ; a battery configured to store the voltage generated by the power generator ; a battery voltage sensor configured to sense a battery voltage charged in the battery ; a motor mounted on at least one of a front wheel and a rear wheel and configured to provide a rotational force to a mounted wheel by power supplied from the battery ; a pedal speed sensor configured to sense a speed of the pedal ; a motor driver configured to drive the motor ; and an electronic control unit configured to drive the motor according to a pedal speed sensed by the pedal speed sensor and to control a current supplied to the motor being driven based on a pedal torque applied to the pedal , wherein the electronic control unit calculates a target wheel speed so as to follow a pedal speed sensed by the pedal speed sensor , to calculate a target motor current according to the calculated target wheel speed, to supply a current to the motor using the motor driver so as to reach the calculated target motor current, characterized in that the electronic control unit , or alternatively a pedal torque estimator of the electric bicycle, estimates the pedal torque applied to the pedal based on the pedal speed sensed by the pedal speed sensor , the battery voltage sensed by the battery voltage sensor , and the power generation current sensed by the power generation current sensor , and wherein the electronic control unit is further configured to change the calculated target wheel speed based on the estimated pedal torque applied to the pedal , to change the target motor current according to the changed target wheel speed, and to change the current supplied to the motor using the motor driver so as to reach the changed target motor current. <EOS>