The present invention suggests lifestyle improvements in a format that is better suited to the situation of a user. A lifestyle improvement suggestion device that acquires biological information that has been measured for a first user or lifestyle information that represents the lifestyle of the first user and, when the acquired information satisfies a prescribed condition, transmits a message that suggests a lifestyle improvement to a user device that is used by a prescribed user. The lifestyle improvement suggestion device comprises a data acquisition unit that also acquires environment information about the environment or the behavior of the first user and a suggestion generation unit that generates the message and transmits the message to the user device in accordance with the environment information or suspends message transmission in accordance with the environment information.
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