It is an object of the present invention to provide a biological information acquiring system and a biological information acquiring method capable of enhancing the calculation accuracy to more accurately calculate the exercise effect information, and capable of enhancing the satisfaction level of the user.In a biological information acquiring system, a body composition meter is configured to acquire pre-exercise body composition data measured before start of exercise and post-exercise body composition data measured after end of exercise. A pedometer is configured to acquire vibration data during exercise. The consumed calorie of the user can be more accurately calculated by arranging consumed calorie correction coefficient acquiring unit for acquiring a consumed calorie correction coefficient α based on the pre-exercise body composition data, the post-exercise body composition data, and the vibration data; and a consumed calorie calculation unit for calculating the consumed calorie using the consumed calorie correction coefficient α.