A software update providing apparatus of a vehicle, comprising: a communication circuit configured to communicate with a server wirelessly; an output device for notifying a vehicle driver; a battery; and a control circuit electrically connected to the communication circuit and the battery, wherein the control circuit is configured to: receive update data associated with a target controller mounted within the vehicle, from the server; calculate a remaining time required for the update including the estimated required time for a software update and the estimated required time for a roll-back, based on a size of the update data; calculate an estimated remaining amount of the battery charge upon completing the update by subtracting a required amount of battery charge for the remaining time based on a battery discharge current from a current remaining amount of the battery charge; and perform the update on the target controller, when the estimated remaining amount of the battery charge is greater than a particular value, wherein the output device is configured to be operated by the control circuit to output a warning message while performing the update, when the estimated remaining amount of battery charge is less than a particular value, wherein the control circuit is configured to interrupt the update and perform the roll-back, when the current remaining amount of the battery charge is less than a particular value. a communication circuit configured to communicate with a server wirelessly; an output device for notifying a vehicle driver; a battery; and a control circuit electrically connected to the communication circuit and the battery, wherein the control circuit is configured to: receive update data associated with a target controller mounted within the vehicle, from the server; calculate a remaining time required for the update including the estimated required time for a software update and the estimated required time for a roll-back, based on a size of the update data; calculate an estimated remaining amount of the battery charge upon completing the update by subtracting a required amount of battery charge for the remaining time based on a battery discharge current from a current remaining amount of the battery charge; and perform the update on the target controller, when the estimated remaining amount of the battery charge is greater than a particular value, receive update data associated with a target controller mounted within the vehicle, from the server; calculate a remaining time required for the update including the estimated required time for a software update and the estimated required time for a roll-back, based on a size of the update data; calculate an estimated remaining amount of the battery charge upon completing the update by subtracting a required amount of battery charge for the remaining time based on a battery discharge current from a current remaining amount of the battery charge; and perform the update on the target controller, when the estimated remaining amount of the battery charge is greater than a particular value, wherein the output device is configured to be operated by the control circuit to output a warning message while performing the update, when the estimated remaining amount of battery charge is less than a particular value, wherein the control circuit is configured to interrupt the update and perform the roll-back, when the current remaining amount of the battery charge is less than a particular value.