A control system of a vehicle, comprising: an electronic control unit configured to: (a) measure characteristics of a battery installed on the vehicle; (b) determine whether the battery is a designated battery for an exclusive use in an idling stop vehicle or a non-designated battery, based on at least one of the characteristics; and (c) determine whether an idling stop function of the vehicle is permitted to be executed, based on a threshold value of at least one of the characteristics of the battery, the threshold value being set to a first threshold value when the battery is determined as the designated battery, and set to a second threshold value that is different from the first threshold value when the battery is determined as the non-designated battery, characterized in that the electronic control unit is further configured such that at least one of the characteristics of the battery based on which it is determined whether the idling stop function of the vehicle is permitted to be executed includes a lowest voltage measured when an engine is started, and the first threshold value of the lowest voltage used when the battery is determined as the designated battery is lower than the second threshold value of the lowest voltage used when the battery is determined as the non-designated battery. an electronic control unit configured to: (a) measure characteristics of a battery installed on the vehicle; (b) determine whether the battery is a designated battery for an exclusive use in an idling stop vehicle or a non-designated battery, based on at least one of the characteristics; and (c) determine whether an idling stop function of the vehicle is permitted to be executed, based on a threshold value of at least one of the characteristics of the battery, the threshold value being set to a first threshold value when the battery is determined as the designated battery, and set to a second threshold value that is different from the first threshold value when the battery is determined as the non-designated battery, (a) measure characteristics of a battery installed on the vehicle; (b) determine whether the battery is a designated battery for an exclusive use in an idling stop vehicle or a non-designated battery, based on at least one of the characteristics; and (c) determine whether an idling stop function of the vehicle is permitted to be executed, based on a threshold value of at least one of the characteristics of the battery, the threshold value being set to a first threshold value when the battery is determined as the designated battery, and set to a second threshold value that is different from the first threshold value when the battery is determined as the non-designated battery, characterized in that the electronic control unit is further configured such that at least one of the characteristics of the battery based on which it is determined whether the idling stop function of the vehicle is permitted to be executed includes a lowest voltage measured when an engine is started, and the first threshold value of the lowest voltage used when the battery is determined as the designated battery is lower than the second threshold value of the lowest voltage used when the battery is determined as the non-designated battery.