A remote server is capable of acquiring income distribution of a fishing ground. The remote server receives information on positions of a fishing boat, information on operating days of the fishing boat, and income and fuel consumption of the fishing boat on each operating day or at each position of the operating day. The remote server outputs the income and the fuel consumption for each operating day and makes an income distribution map expressing distribution of corbiculae. The remote server outputs the number of times of receipt of the information on the positions on each operating day on the map and makes a collection spot distribution map expressing distribution of the collection spot by the fishing boat.