To provide information for care of trees planted in a garden of an own house to a user at the optimum timing.

In this system wherein a classified-by-house control server 1 having a tree database 15 stored with data as to trees and having a classified- by-house database 16 stored with kinds of the trees planted in correlattion with exterior work to be classified by the houses is connected bidirectionally to a customer terminal 2 for receiving the information as to the trees from the control server 1 via a communication network N, the control server 1 is provided with a means for reading out list information of the tree data stored in the database 16 to be transmitted to the customer terminal 2 based on a requirement indication of the information for the care transmitted from the customer terminal 2, and a mean for reading out the information for the care of the corresponding tree from the tree database 15 to be transmitted to the customer terminal 2 when the optional tree is selected from the list information in the customer terminal 2.