A reward determination system determines distribution of a reward received from a data user to reward distribution targets in a platform for distribution and utilization of biological data provided by data providers. Each reward distribution target has: development task information obtained by quantifying a workload of a task required for developing the platform into numbers; data provision task information obtained by quantifying a workload of a task required for providing the biological data into numbers; and data processing task information obtained by quantifying a workload of a task required for processing the biological data into numbers. A reliability parameter and a contribution parameter of each task are calculated based on the development task information, the data provision task information, and the data processing task information on each task, and a reward to be allocated is determined for each reward distribution target based on the reliability parameter and the contribution parameter.