PURPOSE: To provide the time prediction system for a hospital job capable of accurately grasping the congestion conditions of the hospital job and obtaining the processing time required for examination or the like beforehand.

CONSTITUTION: A hospital information system 1 is composed of plural sub systems provided for respective job departments inside a hospital (an ordering system 2, a radiology department 3, a species of examination 4, accounting 5 and reception 6), a data base device 7 for preserving and managing patient information or the like, an entire system management device 8 for managing information relating to the state of the entire system or the like and a processing time prediction device 9 for holding a time prediction model beforehand and predicting the processing time. The respective components are mutually communicably connected through a basic network 10. The respective sub systems 2-6 are composed of plural terminals (the terminal 2b inside the ordering system 2 for instance) and sub system management devices 2a-6a for managing the information relating to operation states inside the respective sub systems or the like and are mutually communicably connected through a branch network.