Information processing method and information processor

In an information processor, an acquirer acquires a departure point and transportation of each of multiple users and a destination in common. A provisional setting unit provisionally sets a meeting place multiple times. For the meeting place provisionally set each time, a calculation unit derives a travel cost of each user required for traveling from the departure point of the user through the meeting place to the destination, and a join cost of each user required for joining at the meeting place based on the transportation of the user, and calculates the sum of the travel costs and the join costs of the respective users. Based on the multiple calculated sums, a formal setting unit formally sets a meeting place.