To provide high-quality side dish pet food at a low cost.

This side dish pet food supplying system has a food material-receiving homepage 19 which inputs information about food material sale by a food material offerer, a food material offerer information memory part 24, a food material information memory part 25 which memorizes food material information inputted by the food material offerer, a food material evaluated value calculation part 26 which calculates a food material evaluated value based on the inputted food material information, and a comparison and discrimination part 27 which compares the calculated evaluated value with a reference value and discriminates whether it is all right or not to purchase the food material. Furthermore, the system has an electronic mail part 29 which responds to the discrimination that the food material can be purchased, and reports the food material offerer information and the food material information to the administrator of the system, and a homepage control part 30 which responds to the discrimination that the food material cannot be purchased and indicates intention that the food material cannot be purchased in the food material receiving homepage 19.